Potentially explosive environmentsSwitch your device off in potentially explosive environments, such as near petrolpumps. Sparks may cause an explosion or fire resulting in injury or death. Noterestrictions in areas with fuel, chemical plants, or where blasting operations are inprogress. Areas with a potentially explosive environment may not be clearly marked.These are usually areas where you are advised to switch your engine off, below deckon boats, chemical transfer or storage facilities, and where the air containschemicals or particles. Check with the manufacturers of vehicles using liquefiedpetroleum gas (such as propane or butane) if this device can be safely used in theirvicinity.Certification information (SAR)This mobile device meets guidelines for exposure to radio waves.Your mobile device is a radio transmitter and receiver. It is designed not to exceedthe limits for exposure to radio waves (radio frequency electromagnetic fields),recommended by international guidelines from the independent scientificorganisation ICNIRP. These guidelines incorporate substantial safety margins thatare intended to assure the protection of all persons regardless of age and health.The exposure guidelines are based on the Specific Absorption Rate (SAR), which is anexpression of the amount of radio frequency (RF) power deposited in the head orbody when the device is transmitting. The ICNIRP SAR limit for mobile devices is 2.0W/kg averaged over 10 grams of tissue.SAR tests are carried out with the device in standard operating positions,transmitting at its highest certified power level, in all its frequency bands.Please refer to www.nokia.com/phones/sar for the maximum SAR value of thedevice.This device meets RF exposure guidelines when used against the head or whenpositioned at least ⅝ inches (1.5 centimetres) away from the body. When the deviceis kept in a carry case, belt clip, or other form of device holder during use, the holdershould not contain metal and should provide at least the above-stated separationdistance from the body.Nokia 5.1 User Guide© 2018 HMD Global Oy. All rights reserved. 72