GQ GMC-320Plus Fulfill Nuclear Radiation Detector Meter Test Equipment Two versatile mode: unit alone or together with PC Press the right button, the unit turn on, reading shows up in a few seconds Date, time, battery icon on the LCD display Real-time Graphic, Text and Large Font mode. Zoom feature Built-in audible and visual signals to alert Dot matrix LCD digital display with back light (contrast, brightness adjustable) Rechargeable battery included. Chargeable via USB or wall or car charger Data logging feature, record data first and process or play later Standard Data viewer software included for free. Stay connected with Geiger Counter World Map website Radiation detection: Beta, Gamma and X-Ray Detectable Energy Range: 0.1~3.0 MeV Own Background: 0,2 Pulses/s Working Voltage: 3.2-4.0VL CD Display: Dot matrix with back light Working power: 0.045W - 0.2W Power: 3.6V/3.7V battery / USB power Main unit size: 5 x 2.8 x 1 inches Weight: 4 oz Automatic data recording. Download 1:1 simulation software let you experience the device UI operation before make purchase  decision. User-end firmware upgrade. GQ online support community forum. USA service center Free software as well as professional data logging software is available. Accepts both rechargeable and non-rechargeable 3.6V/3.7V batter