Features： 1、1. Accurate measurement: built‑in electromagnetic radiation sensor. After processing by the control microchip, the radiation value can be displayed on a clear LCD digital display. The unit of radiation for testing the magnetic field can be mG/μT, and the unit of the electric field is V/m. 2、2. Three‑speed value: Use three‑color light for quick detection to remind you whether the current radiation level is safe. Safety (0‑1.99 mg / 0‑0.19 ut); Caution (2‑3.99 mg /0.2‑0.39 ut); Danger (greater than 4 mg / 0.4 ut). If you're in danger, it will sound an alarm. 3、3. Multiple functions: test average or maximum reading, one click to save the data display. Large backlit LCD display is clear and clear. Shut down automatically after 5 minutes of idle. 4、4. Wide application: The measurement frequency can reach 5Hz to 3500MHz. Mainly used for testing TV sets, computers, printers, microwave ovens, refrigerators, low‑frequency home appliances, etc 5、5. Please note: The machine is powered by 3 AAA batteries, not included. You need to buy it yourself. Specification： Material: plastic Size: 12.5*6*2.8cm Weight: about 125g Package include: 1* Electromagnetic Radiation Detector Package List： 1* Electromagnetic Radiation Detector