Equipped with sound and light dual alarm prompt function, when the detection of the current environmental radiation reaches the set alarm value, the instrument will make sound and light for prompts. Powered by 2 * AA batteries, low power consumption, long battery lifespan, you need to prepare it by yourself. Name: Electromagnetic Radiation Detector Battery: 2 * 1.5V AA battery (not included) Electric field strength test ranges: 1V/m-1999V/m Magnetic field strength test ranges: 0.0μT-99.99μT Temperature test ranges: -10℃ to 70℃ Electromagnetic radiation ranges: Less than 40V/m and Less than 0.4μT Colour:black Material:plastic Package Contents: 1 x Nuclear Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. A large, clear-definition screen with backlight display, large font and large viewing angle, it can easily cope with the at night and the bright light during the day for a more comfortable experience. The alarm value can be set to support the electric field/magnetic field alarm value settings. The dual measurement of magnetic field/electric field can detect the magnetic field / electric field strength. Multifunctional design, it can also be used to measure the temperature of the current environment with quick response speed, ℃ and ℉ switchable. Compact size, and portable, built-in high-accurate chip, practical and reliable to use.