Endurance and Auto Off: The rechargeable electromagnetic field radiation detector has the ability to set the screen off time (1 to 9 minutes or always on) and auto off time (1 to 9 hours or always on) at any time. detector has a built-in rechargeable Li-ion battery with a battery life of up to 20 hours, even when used outdoors. The EF detector has a built-in rechargeable lithium battery that lasts up to 20 hours, even when used outdoors Versatile Applications: EMF Meter can detect microwave radiation emitted by WiFi signals, 5G signals, microwave ovens and other appliances, as well as measure electromagnetic radiation emitted by household appliances such as , induction cookers, rice cookers, refrigerators, computers, and power strips. It can help you layout your room to avoid placing you in a high radiation environment Sound and Light Alarm: If the test result of digital emf meter exceeds the alarm setting value, the alarm be activated. At this time, the red light blinks, the buzzer beeps, and the EMF detector screen lights up automatically even when the screen is off. If you need to turn off the sound, you can operate in the power saving settings EMF Detectors: The rechargeable electromagnetic field radiation detector accurately detects electric field strength (EF), radiated power () and magnetic field strength (MF). The EMF radiation meter has a built-in high sensitivity EF sensor extends the measurement range from 50MHz to 3.5GHz, providing you with a comprehensive monitoring of the electromagnetic environment Parameter Details: The EMF reader is designed with a TFT2.0 colour screen, measures 117.8 x 50.8 x 19.8 mm and weighs 67 grams, making it easy to carry. It can detect electric field from 0.1 - 2000V/m, radiation from 0.2 - 5400mW/m² (540μW/cm²) and magnetic field from 0.1 - 1200Gs (0.01 - 120mT). The range of alarm values can be set on demand, greatly enhancing the user experience, Weight: 0.43100372221 pounds, Manufacturer: Prterver