Use silent and alarm modes, test and pause modes, and the backlight can be turned on or off. This detector can test electric field radiation and magnetic field emission to reach the optimal test result. It's widely used to test and learn electromagnetic radiation situation indoor and outdoor. specification: Material: ABS Color: Black Test Range: Power density: 0-99.999μw/c㎡ Electric field intensity: 0-999.99v/m Magnetic field strength: 0-99.999μT Test accuracy: Power density: 0.001μw/c㎡ Electric field intensity: 0.01v/m Magnetic field strength: 0.001μT Frequency Range: Power density: 50MHz-5GHz Electric field strength: 20Hz-100MHz Magnetic field strength: 20Hz-1MHz Battery: 3 x AA 1.5V batteries or 3 x 1.2V rechargeable batteries (not included) Charging: USB 5V 2A input Charging time: ≥4 hours Item size: 105 x 70 x 30mm / 4.1 x 2.8 x 1.2 inches Product weight: 100 grams / 3.5 ounces Package Contents: 1 x Electromagnetic radiation detector 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. The shell is made of high-quality ABS, which has excellent heat resistance and cold resistance, high strength and excellent toughness. It can meet the needs of detection, substation detection, mobile signal tower detection, etc., and is easy to carry. Features: XR-2 Function: Test electric and magnetic fields and radio frequencies The large-screen display makes it easier to read data, and the buttons are easy to operate.