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LG

K40

2019
K40

Description

Dimensions: 75 x 153 x 7.2 mm
SoC: МеdiаТеk МТ6750Т
CPU: 4х 1.3 GНz АRМ Соrtех-А53, 1300 MHz, Cores: 4
GPU: ARM Mali-T720 MP2, 650 MHz, Cores: 2
RAM: 2 GB, 540 MHz
Storage: 16 GB
Memory cards: microSD, microSDHC
Display: 5.5 in, IPS, 1080 x 2160 pixels, 24 bit
Battery: 3000 mAh, Li-Polymer
OS: Аndrоid 5.1 Lоlliрор
Camera: 4608 x 3096 pixels, 1920 x 1080 pixels, 30 fps
SIM card: Nano-SIM
Wi-Fi: b, g, а
USB: 2.0, Micro USB
Bluetooth: 4.1
Positioning: GРS, А-GРS

Brand and model

Information about the brand, model and model alias (if any) of a specific device.

Brand

Brand name of the company that manufactures the device.

LG
Model

Model name of the device.

K40
Model alias

Аlternative names, under which the model is known.

LM-X420EM
X420EM
LM-X420EMW
X420EMW

Design

Information about the dimensions and weight of the device, shown in different measurement units. Body materials, available colors, certifications.

Width

Information about the width, i.e. the horizontal side of the device when it is used in its standard orientation.

75 mm (millimeters)
7.5 cm (centimeters)
0.246 ft (feet)
2.953 in (inches)
Height

Information about the height, i.e. the vertical side of the device when it is used in its standard orientation.

153 mm (millimeters)
15.3 cm (centimeters)
0.502 ft (feet)
6.024 in (inches)
Thickness

Information about the thickness/depth of the device in different measurement units.

7.2 mm (millimeters)
0.72 cm (centimeters)
0.024 ft (feet)
0.283 in (inches)
Volume

Estimated volume of the device, calculated from the dimensions provided by the manufacturer. Applies for devices in the form of a rectangular parallelepiped.

82.62 cm³ (cubic centimeters)
5.02 in³ (cubic inches)
Colors

Information about the colors, in which the device is available in the market.

Gold
Body materials

Materials used in the fabrication of the device's body.

Plastic

SIM card

The Subscriber Identity Module (SIM) is used in mobile devices for storing data authenticating the subscribers of mobile services.

SIM card type

Information about the type and size (form factor) of the SIM card used in the device.

Nano-SIM (4FF - fourth form factor, since 2012, 12.30 x 8.80 x 0.67 mm)
Number of SIM cards

Information about the number of SIM cards, supported by the device.

2
Features

Information about some specific features related to the SIM card(s) of the device.

Dual SIM stand-by (Both cards are active. When one is busy, the other is not active)

Networks

A mobile (cellular) network is a radio system, which allows a large number of mobile devices to communicate with each other.

GSM

GSM (Global System for Mobile Communications) was developed to replace the analog cellular network (1G), therefore it is referred to as a 2G mobile network. It has been improved with the addition of General Packet Radio Services (GPRS) and later via the Enhanced Data rates for GSM Evolution (EDGE) technology.

GSМ 850 МНz
GSМ 900 МНz
GSМ 1900 МНz
W-CDMA

W-CDMA (Wideband Code Division Multiple Access) is an air interface used by 3G mobile networks. It is one of the three different UMTS interfaces together with the TD-SCDMA and the TD-CDMA. The standard provides faster data transfer speeds and allows more users to connect to the network simultaneously.

W-CDMA 850 MHz
W-CDMA 900 MHz
W-CDMA 1900 MHz
W-CDMA 2100 MHz
LTE

LTE is deemed to be the fourth generation (4G) of mobile communications technology. It has been developed by the 3GPP based on the GSM/EDGE and UMTS/HSPA technologies in order to increase the speed and capacity of wireless data networks. A further development of the technology is called LTE Advanced.

LТЕ 800 МНz
LТЕ 1800 МНz
LТЕ 2100 МНz
LТЕ-ТDD 2300 МНz (В40)

Mobile network technologies and bandwidth

Communication between devices within mobile networks is realized via various generations of network technologies, which provide different bandwidth.

Mobile network technologies

There are several network technologies that enhance the performance of mobile networks mainly by increased data bandwidth. Information about the communication technologies supported by the device and their respective uplink and downlink bandwidth.

UМТS
GРRS Сlаss 12
LТЕ Саt 4

Operating system

Operating system is the system software, which manages and controls the functioning of the hardware components of the device.

Operating system (OS)

Information about the operating system used by the device as well as its version.

Аndrоid 5.1 Lоlliрор

System on Chip (SoC)

A system on a chip (SoC) includes into a single chip some of the main hardware components of the mobile device.

SoC

The SoC integrates different hardware components such as the CPU, GPU, memory, peripherals, interfaces, etc., as well as software for their functioning.

МеdiаТеk МТ6750Т
Process technology

Information about the process technology used in manufacturing the chip. The value in nanometers represents half the distance between elements that make up the CPU.

28 nm (nanometers)
CPU

CPU is the Central Processing Unit or the processor of a mobile device. Its main function is to interpret and execute instructions contained in software applications.

4х 1.3 GНz АRМ Соrtех-А53
CPU bits

The CPU bits are determined by the bit-size of the processor registers, address buses and data buses. 64-bit CPUs provide better performance than 32-bit ones, which on their part perform better than 16-bit processors.

32 bit
Instruction set

The instruction set architecture (ISA) is a set of commands used by the software to manage the CPU's work. Information about the set of instructions the processor can execute.

ARMv7
Level 1 cache memory (L1)

The cache memory is used by the processor in order to shorten the time needed to access data and instructions that a frequently used. The L1 (level 1) cache memory has a small volume, but operates faster than the RAM and the rest cache memory levels. If the processor does not find the data needed in L1, it continues to look for it in the L2 cache memory. In some processors the search in L1 and L2 is simultaneous.

16 KB + 16 KB (kilobytes)
Level 2 cache memory (L2)

The L2 (level 2) cache memory is slower than L1, but has a larger capacity, instead, which allows it to cache more data. Just like L1, it is much faster than the system memory (RAM). If the CPU does not find the data needed in L2, it proceeds to look for them in the L3 cache memory (if there is such) or in the RAM.

512 KB (kilobytes)
0.5 MB (megabytes)
CPU cores

A CPU core is the processor unit, which executes software instructions. Presently, besides single-core processors, there are dual-core, quad-core, hexa-core and so on multi-core processors. They increase the performance of the device allowing the execution of multiple instructions in parallel.

4
CPU frequency

The frequency of the processor describes its clock rate in cycles per second. It is measured in Megahertz (MHz) or Gigahertz (GHz).

1300 MHz (megahertz)
GPU

GPU is a graphical processing unit, which handles computation for 2D/3D graphics applications. In mobile devices GPU is usually utilized by games, UI, video playback, etc. GPU can also perform computation in applications traditionally handled by the CPU.

ARM Mali-T720 MP2
GPU cores

Similar to the CPU, the GPU consists of processing units called cores. They handle the computation of graphics in various applications.

2
GPU frequency

The frequency is the clock rate of the graphic processor (GPU), which is measured in Megahertz (MHz) or Gigahertz (GHz).

650 MHz (megahertz)
RAM capacity

RAM (Random-Access Memory) is used by the operating system and all installed applications. Data in the RAM is lost after the device is turned off or restarted.

2 GB (gigabytes)
RAM type

Information about the type of RAM used by the device.

LPDDR3
RAM channels

Information about the number of RAM channels integrated in the SoC. More channels mean higher data transfer rates.

Single channel
RAM frequency

RAM frequency relates directly to the rate of reading/writing from/in the RAM memory.

540 MHz (megahertz)

Storage

Every mobile device has a built-in storage (internal memory) with a fixed capacity.

Storage

Information about the capacity of the built-in storage of the device. Sometimes one and the same model may is offered in variants with different internal storage capacity.

16 GB (gigabytes)

Memory cards

Memory cards are used in mobile devices for expanding their external storage capacity.

Types

The various types of memory cards are characterized by different sizes and capacity. Information about the supported types of memory cards.

microSD
microSDHC

Display

The display of a mobile device is characterized by its technology, resolution, pixel density, diagonal length, color depth, etc.

Type/technology

One of the main characteristics of the display is its type/technology, on which depends its performance.

IPS
Diagonal size

In mobile devices display size is represented by the length of its diagonal measured in inches.

5.5 in (inches)
139.7 mm (millimeters)
13.97 cm (centimeters)
Width

Approximate width of the display

2.46 in (inches)
62.48 mm (millimeters)
6.25 cm (centimeters)
Height

Approximate height of the display

4.92 in (inches)
124.95 mm (millimeters)
12.5 cm (centimeters)
Aspect ratio

The ratio between the long and the short side of the display

2:1
2:1 (18:9)
Resolution

The display resolution shows the number of pixels on the horizontal and vertical side of the screen. The higher the resolution is, the greater the detail of the displayed content.

1080 x 2160 pixels
Pixel density

Information about the number of pixels per centimeter (ppcm) or per inch (ppi) of the display. The higher the pixel density, the more detailed and clearer is the information displayed on the screen.

439 ppi (pixels per inch)
172 ppcm (pixels per centimeter)
Color depth

The color depth of the display is also known as bit depth. It shows the number of bits used for the color components of one pixel. Information about the maximum number of colors the screen can display.

24 bit
16777216 colors
Display area

The estimated percentage of the screen area from the device's front area.

68.25 % (percent)
Other features

Information about other functions and features of the display.

Capacitive
Multi-touch
Scratch resistant
Corning Gorilla Glass 3
2.5D curved glass screen
OGS (One Glass Solution)
3D - Parallax barrier (Glasses-free)

Sensors

Different sensors measure different physical quantities and convert them into signals recognizable by the mobile device.

Sensors

Sensors vary in type and purpose. They increase the overall functionality of the device, in which they are integrated.

Proximity
Light
Accelerometer

Rear camera

The primary camera of the mobile device is usually placed on its back and can be combined with one or more additional cameras.

Sensor model

Information about the manufacturer and model of the image sensor used by this camera of the device.

Sony Exmor
Sensor type

Information about the sensor type of the camera. Some of the most widely used types of image sensors on mobile devices are CMOS, BSI, ISOCELL, etc.

CMOS (complementary metal-oxide semiconductor)
Pixel size

Pixels are usually measured in microns (μm). Larger ones are capable of recording more light, hence, will offer better low light shooting and wider dynamic range compared to the smaller pixels. On the other hand, smaller pixels allow for increasing the resolution while preserving the same sensor size.

1 µm (micrometers)
0.001000 mm (millimeters)
Focal length and 35 mm equivalent

Focal length is the distance in millimeters from the focal point of the image sensor to the optical center of the lens. The 35 mm equivalent indicates the focal length at which a full-frame camera will achieve an angle of view that's the same as the one of the camera of the mobile device. It is measured by multiplying the native focal length of the camera by the crop factor of the sensor. The crop factor itself can be determined as the ratio between the diagonal distances of the image sensor in the 35 mm camera and a given sensor.

3.57 mm (millimeters)
Flash type

The rear cameras of mobile devices use mainly a LED flash. It may arrive in a single, dual- or multi-light setup and in different arrangements.

LED
Image resolution

One of the main characteristics of the cameras is their image resolution. It states the number of pixels on the horizontal and vertical dimensions of the image, which can also be shown in megapixels that indicate the approximate number of pixels in millions.

4608 x 3096 pixels
14.27 MP (megapixels)
Video resolution

Information about the maximum resolution at which the rear camera can shoot videos.

1920 x 1080 pixels
2.07 MP (megapixels)
Video FPS

Information about the maximum number of frames per second (fps) supported by the rear camera while recording video at the maximum resolution. Some of the main standard frame rates for recording and playing video are 24 fps, 25 fps, 30 fps, 60 fps.

30 fps (frames per second)
Features

Information about additional software and hardware features of the rear camera which improve its overall performance.

Autofocus
Continuous shooting
Digital zoom
Digital image stabilization
Geotagging
Panorama
HDR
Touch focus
Face detection
White balance settings
ISO settings
Exposure compensation
Scene mode

Front camera

Modern smartphones have one or more front cameras and their positioning has led to various design concepts – pop-up camera, rotating camera, notch, punch hole, under-display camera, etc.

Aperture

The aperture (f-stop number) indicates the size of the lens diaphragm opening, which controls the amount of light reaching the image sensor. The lower the f-stop number, the larger the diaphragm opening is, hence, the more light reaches the sensor. Usually, the f-stop number specified is the one that corresponds to the maximum possible diaphragm opening.

f/2
Focal length and 35 mm equivalent

Focal length is the distance in millimeters from the focal point of the image sensor to the optical center of the lens. The 35 mm equivalent indicates the focal length at which a full-frame camera will achieve an angle of view that's the same as the one of the camera of the mobile device. It is measured by multiplying the native focal length of the camera by the crop factor of the sensor. The crop factor itself can be determined as the ratio between the diagonal distances of the image sensor in the 35 mm camera and a given sensor.

2.42 mm (millimeters)
Auxiliary light

Sometimes, front cameras of mobile devices use auxiliary light. Whenever they do, it is most often a screen flash or front LED flash. Information about the type of auxiliary light.

LED
Image resolution

Information about the number of pixels on the horizontal and vertical dimensions of the photos taken by the front camera, indicated in megapixels as well.

3520 x 1780 pixels
6.27 MP (megapixels)

Audio

Information about the type of speakers and the audio technologies supported by the device.

Speaker

The loudspeaker is a device, which reproduces various sounds such as ring tones, alarms, music, voice calls, etc. Information about the type of speakers the device uses.

Loudspeaker
Earpiece

Radio

The radio in a mobile device is a built-in FM radio receiver.

Radio

Information whether the device has an FM radio receiver or not.

No

Tracking/Positioning

Information about the positioning and navigation technologies supported by the device.

Tracking/Positioning

The tracking/positioning service is provided by various satellite navigation systems, which track the autonomous geo-spatial positioning of the device that supports them. The most common satellite navigation systems are the GPS and the GLONASS. There are also non-satellite technologies for locating mobile devices such as the Enhanced Observed Time Difference, Enhanced 911, GSM Cell ID.

GРS
А-GРS

Wi-Fi

Wi-Fi is a technology that provides wireless data connections between various devices within a short range.

Wi-Fi

Wi-Fi communication between devices is realized via the IEEE 802.11 standards. Some devices have the possibility to serve as Wi-Fi Hotspots by providing internet access for other nearby devices. Wi-Fi Direct (Wi-Fi P2P) is another useful standard that allows devices to communicate with each other without the need for wireless access point (WAP).

802.11b (IEEE 802.11b-1999)
802.11g (IEEE 802.11g-2003)
802.11а

Bluetooth

Bluetooth is a standard for secure wireless data transfer between different types of devices over short distances.

Version

The technology has several versions, which improve the connection speed, range, connectivity and discoverability of the devices. Information about the Bluetooth version of the device.

4.1
Features

Bluetooth uses various profiles and protocols related to faster exchange of data, energy saving, better device discoverability, etc. Some of those supported by the device are listed here.

A2DP (Advanced Audio Distribution Profile)

USB

The Universal Serial Bus (USB) is an industry standard that allows different electronic devices to exchange data.

Connector type

There are several USB connector types: the Standard one, the Mini and Micro connectors, On-The-Go connectors, etc. Type of the USB connector used by the device.

Micro USB
Version

There are several versions of the Universal Serial Bus (USB) standard: USB 1.0 (1996), the USB 2.0 (2000), the USB 3.0 (2008), etc. With each following version the rate of data transfer is increased.

2.0
Features

Тhe USB interface in mobile devices may be used for different purposes such as battery charging, using the device as a mass storage, host, etc.

Charging
Mass storage
On-The-Go

Headphone jack

The headphone jack is an audio phone connector, a.k.a. an audio jack. The most widely used one in mobile devices is the 3.5 mm headphone jack.

Headphone jack

Information whether the device is equipped with a 3.5 mm audio jack.

Yes

Connectivity

Information about other important connectivity technologies supported by the devices.

Connectivity

Information about some of the most widely used connectivity technologies supported by the device.

Computer sync
OTA sync
Infrared
Tethering
DLNA
NFC

Browser

A web browser is a software application for accessing, fetching, displaying and navigating through information on the World Wide Web.

Browser

Information about some of the features and standards supported by the browser of the device.

HTML
HTML5
CSS 3

Audio file formats/codecs

Mobile devices support various audio file formats and codecs, which respectively store and code/decode digital audio data.

Audio file formats/codecs

List of some of the most common audio file formats and codecs supported standardly by the device.

AAC (Advanced Audio Coding)
AAC+ / aacPlus / HE-AAC v1
AC3 / AC-3
AMR / AMR-NB / GSM-AMR (Adaptive Multi-Rate, .amr, .3ga)
AMR-WB (Adaptive Multi-Rate Wideband, .awb)
aptX / apt-X
aptX HD / apt-X HD / aptX Lossless
eAAC+ / aacPlus v2 / HE-AAC v2
FLAC (Free Lossless Audio Codec, .flac)
MIDI
MP3 (MPEG-2 Audio Layer II, .mp3)
OGG (.ogg, .ogv, .oga, .ogx, .spx, .opus)
WMA (Windows Media Audio, .wma)
WAV (Waveform Audio File Format, .wav, .wave)

Video file formats/codecs

Mobile devices support various video file formats and codecs, which respectively store and code/decode digital video data.

Video file formats/codecs

List of some of the most common video file formats and codecs supported standardly by the device.

3GPP (3rd Generation Partnership Project, .3gp)
AVI (Audio Video Interleaved, .avi)
H.263
H.264 / MPEG-4 Part 10 / AVC video
MP4 (MPEG-4 Part 14, .mp4, .m4a, .m4p, .m4b, .m4r, .m4v)
VC-1
VP8
WMV (Windows Media Video, .wmv)
WMV7 (Windows Media Video 7, .wmv)
WMV8 (Windows Media Video 8, .wmv)
WMV9 (Windows Media Video 9, .wmv)
Xvid

Battery

The batteries of mobile devices differ in capacity and technology. They provide the electrical charge needed for the functioning of the devices.

Capacity

The capacity of a battery shows the maximum charge, which it can store, measured in mili-Ampere hours.

3000 mAh (milliampere-hours)
Type

The battery type is determined by its structure and more specifically, by the chemicals used in it. There are different battery types and some of the most commonly used in mobile devices are the lithium-ion (Li-Ion) and the lithium-ion polymer battery (Li-Polymer).

Li-Polymer
2G talk time

2G talk time is the time period a battery charge will last, if one is constantly talking on the phone in a 2G cellular network.

16 h (hours)
960 min (minutes)
0.7 days
2G stand-by time

2G stand-by time is the longest time a battery charge will last, if the device is not used but is constantly connected to the 2G cellular network.

100 h (hours)
6000 min (minutes)
4.2 days
3G talk time

3G talk time is the time period a battery charge will last, if one is constantly talking on the phone in a 3G cellular network.

16 h (hours)
960 min (minutes)
0.7 days
3G stand-by time

3G stand-by time is the longest time a battery charge will last, if the device is not used but is constantly connected to the 3G mobile network.

500 h (hours)
30000 min (minutes)
20.8 days
Features

Information about some additional features of the device's battery.

Non-removable

Specific Absorption Rate (SAR)

The SAR rating shows the amount of electromagnetic radiation absorbed by the human body when using a mobile device, expressed in W/kg.

Head SAR (EU)

The SAR head rating shows the highest level of exposure to electromagnetic radiation measured when the device is held next to the ear in a talk position. In Europe, the SAR limit for hand-held mobile devices is set to 2 W/kg per 10 g of tissue. This standard is specified by the CENELEC, complies with the IEC standards and follows the ICNIRP Guidelines 1998.

0.268 W/kg (watts per kilogram)

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