Samsung Xcover 4 UK SIM-Free Smartphone - Dark Silver

Product Information

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

This SAR rating shows the maximum level of exposure to electromagnetic radiation taken when the device is placed next to the ear. The applicable limit for the US is 1.6 W/kg per 1 g of tissue. In the US the FCC tests and sets the SAR limits for all mobile devices, which are controlled by the CTIA. 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. 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) One of the main characteristics of the display is its type/technology, on which depends its performance. 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.Display The display of a mobile device is characterized by its technology, resolution, pixel density, diagonal length, color depth, etc. Type/technology Design Information about the dimensions and weight of the device, shown in different measurement units. Body materials, available colors, certifications. Width 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).

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. The device's storage configuration could be more generous, but its extensive operating system and quite useful primary camera are convincing. The input options are diverse, the screen is appropriate, and the performance sufficient for daily routine. The battery life also fits well to the good overall impression. We did not like the handset's sound quality and gaming performance as much, though. The SAR body rating shows the maximum level of exposure to electromagnetic radiation when the device is positioned against the body at the hip. The highest SAR value of mobile devices allowed in the US is set to 1.6 W/kg per 1 g of tissue. It is specified by the FCC and the CTIA follows whether the mobile devices comply with this standard.

Emissions

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. 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. Similar to the CPU, the GPU consists of processing units called cores. They handle the computation of graphics in various applications. UMTS stands for Universal Mobile Telecommunications System. Based on the GSM standard, it is deemed as a 3G mobile network standard. It has been developed by the 3GPP and its major advantage is the provision of greater bandwidth and spectral efficiency, due to the W-CDMA technology. 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.

Networks A mobile (cellular) network is a radio system, which allows a large number of mobile devices to communicate with each other. GSM The Samsung Galaxy Xcover 4 is an Android smartphone produced by Samsung Electronics and released in April 2017. It is the successor to the Samsung Galaxy Xcover 3. The Xcover 4 is waterproof and dustproof designed around the IP68 specifications. The device is also MIL-STD-810G certified, which means that in theory it should easily withstand salty air, high or low temperatures or low pressure. However, according to Wikipedia, the test conditions for consumer devices are not controlled since it is a military standard. Samsung can thus specify its own test criteria – this should be kept in mind. According to the manufacturer, the smartphone had to pass the following tests to achieve the MIL-STD 810G certification: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. Estimated volume of the device, calculated from the dimensions provided by the manufacturer. Applies for devices in the form of a rectangular parallelepiped. 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.