1[Color Indication] The radiation detector provides a quick detection using three colors to indicate the radiation level and alert you whether the current radiation level is safe. 2[Applications] Many industrial equipment and household appliances generate electromagnetic radiation, and can be used in kitchens, high voltage equipment, homes, factories, offices, etc. 3[Beep Sound Alert] Handheld radiation detector with three levels of distinction, once the highest will beep sound to prompt you. Can detect RF, magnetic field and electric field strength. 4[One Key Lock Screen] This electromagnetic radiation meter with a key lock screen function, to keep the data does not jump, so that you can read the data more clearly and intuitively. 5[Battery Power Supply] Electromagnetic radiation detector uses 3 AAA dry batteries (not included) for power supply, easy to carry, without worrying about plugging in the problem.