Size of the display for this product, measured diagonally, usually in inches.

Type of display (screen) e.g. LCD.

Resolution of the display for the system

The difference in light intensity between the brightest white and the darkest black.

Brightness is quality of the amount of radiating light emitted from the screen. The brightness rating is measured in candelas per square meter, commonly known as 'nits'.

There are a variety of touchscreen technologies that have different methods of sensing touch, including resistive and capacitive.

A family of processors is a group of processors produced by one company over a short period of time e.g. Intel Pentium processors.

The model number for the processor in a computer.

The number of central processing units ('cores') in a processor. Some processors have 1 core, others have 2 (e.g. Intel Core Duo) or more (e.g. the Intel Xeon E7-2850 has 10 cores).

The amount e.g of data which can be stored inside the device.

Types of memory cards which can be used with this product.

The resolution of the images produced with the rear camera, given in MP (megapixel. 1 MP = 1 million pixels).

Indicates the optical zoom capacity, which is the number of times that the picture can be enlarged with the optics of the camera.

Indicates the digital zoom capacity, the number of times that the picture is enlarged thanks to digital technology.

Indicates the type of the camera at the front of the product, dual or single.

Whether or not the rear camera features its own flash.

This is the maximum frame rate, also known as frame frequency and frames per second (FPS). It is the frequency (rate) at which an imaging device produces unique consecutive images called frames. The term applies equally well to film and video cameras, computer graphics, and motion capture systems. Frame rate is most often expressed in frames per second (FPS) and is also expressed in progressive scan monitors as hertz (Hz).

Indicates the type of the camera at the back of the product, dual or single.

Device focusing a camera or other piece of equipment automatically.

This camera function compensates for slight shaking movements caused by an unstable position and ensures smooth footage even in suboptimal conditions.

How many SIM cards the device can hold.

Popular technology that allows an electronic device to exchange data or connect to the internet wirelessly using radio waves.

The type of wireless local area network (LAN): ad-hoc (where units in a network communicate peer-to-peer) or Infrastructure (units communicate with each other via an access point). A LAN interconnects computers in a small area e.g. home, school or office.

Bluetooth is a low-power radio technology developed to replace the cables and wires currently used to link or connect electronic devices such as personal computers, printers, and a wide variety of handheld devices including mobile phones. Because it uses radio-wave connectivity, a Bluetooth-enabled device has a constant, established connection to whatever browser it uses. This saves the user the trouble of logging on to check for emails or news updates, for example.

The type of bluetooth technology in the product e.g. Bluetooth Smart (v4.0).

AirPlay (previously called AirTunes when it was for audio only) is a proprietary protocol stack/suite developed by Apple Inc. that allows wireless streaming of audio, video, and photos, together with related metadata between devices. Originally only implemented in Apple's software and devices, Apple has licensed the AirPlay protocol stack as a third-party software component technology to manufacturer partners for them to use in their products in order to be compatible with Apple's iDevices.

The type of cellular connection subscription.

The device features a socket into which a USB cable can be plugged.

How headphones connect to a device e.g. wirelessly or via a cable and connector.

The product comes with a connector for the Apple Lightning system.

Multimedia Messaging Service (MMS) is a standard way to send messages that include multimedia content to and from a mobile phone over a cellular network

The format is determined by shape, size, presentation and medium.

The colour e.g. red, blue, green, black, white.

The IP code classifies and rates the degree of protection provided against the intrusion (including body parts such as hands and fingers), dust, accidental contact, and water by mechanical casings and electrical enclosures. It is published by the International Electrotechnical Commission (IEC). The digits (characteristic numerals) indicate conformity with the conditions summarized in the tables below. Where there is no protection rating with regard to one of the criteria, the digit is replaced with the letter X. an electrical socket rated IP22 is protected against insertion of fingers and will not be damaged or become unsafe during a specified test in which it is exposed to vertically or nearly vertically dripping water. Another example is the Sony Xperia Z Ultra, one of the first cellular phones to be IP-rated; it is rated at IP58 and marketed as "dust resistant" and can be "immersed in 1.5 meter of freshwater for up to 30 minutes".

Physical effects from which the product is protected e.g. water resistant, crash proof.

What the casing of the product is made of.

Device has a microphone and loudspeaker provided separately from those in the handset. This device allows multiple persons to participate in a conversation. The loudspeaker broadcasts the voice or voices of those on the other end of the telephone line, while the microphone captures all voices of those using the speakerphone.

Global Positioning System (GPS) is a space-based satellite navigation system that provides location and time information in all weather conditions, anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites. The system provides critical capabilities to military, civil and commercial users around the world. It is maintained by the United States government and is freely accessible to anyone with a GPS receiver.

Electronic instrument used for navigation that shows directions in a frame of reference (north, south, east, west) that is stationary relative to the surface of the earth.

Whether the navigation system can locate the phone's position.

The audio formats which this device or software can read/use e.g. MP3, MP4.

The type of video formats that can be used by this device.

Description of a technology platform including a processor, chipset, platform software and wired networking capabilities

Type of operating system on a device e.g. IOS on Apple devices, Android for mobile devices.

Depending on the make of the device, a different application is pre-installed that can understand voice commands and complete tasks for a user, e.g. Apple Siri, Amazon Alexa.

Windows vesions wich can be used with the device.

Mac operating systems e.g. OS X can be used with the device.

Software distributed with another product such as a piece of computer hardware or other electronic device, or a group of software packages which are sold together. A software suite is an example of bundled software, as is software which is pre-installed on a new computer.

The type of battery in the device, e.g. nickel–cadmium (NiCd).

Number of hours on average for continuous play. This is dependent on the device battery capacity.

The device e.g. smartphone, tablet uses gravity to sense whether it should be displaying in portrait or landscape mode.

The measurement or extent of something from side to side.

The distance from the front to the back of something.

Height of the product

Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.

SAR stands for Specific Absorption Rate which is the unit of measurement for the amount of radio frequency energy absorbed by the head when using mobile equipment.

SAR stands for Specific Absorption Rate which is the unit of measurement for the amount of radio frequency (RF) energy absorbed by the body when using mobile equipment.

The minimum and maximum temperatures at which the product can be safely operated.

The minimum and maximum temperatures at which the product can be safely stored.

The device comes with a headset.