Large screen display makes it easier to read data, and the buttons are easy to operate. The housing is made of fine quality ABS, which has fine heat resistance and cold resistance, high strength and fine toughness. It can meet the needs of detection, substation detection, mobile signal tower detection, etc., and it is easy and convenient to carry around. With mute and alarm mode, test and pause mode, and the backlight can be turned on or off. Test range: Power density: 0-99.999μw/c㎡ Electric field intensity: 0-999.99v/m Magnetic field intensity: 0-99.999μT Test accuracy: Power density: 0.001μw/c㎡ Electric field intensity: 0.01v/m Magnetic field intensity: 0.001μT Frequency range: Power density: 50MHz-5GHz Electric field intensity: 20Hz-100MHz Magnetic field intensity: 20Hz-1MHz Battery: 3 * AA 1.5V battery or 3 * 1.2V rechargeable battery (not included) Charging: USB 5V 2A input Charging time: or equal to 4 hours size: 105 x 70 x 30mm Material: plastic colour: black Package Contents: 2 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.