1、5V power supply, or 3 * 1.5V battery; 4 * 1.2V battery, current: 30mA - 120mA. 2、For the detection of 20mR/h-120mR/h of gamma rays and 100-1800 off variables/points of the soft beta ray. 3、Equipped with sound and light alarm. 4、Supports most of the Geiger tube: M4011, STS-5, SBM20, J305, etc. (the 330-600V operating voltage of the Geiger tube can be supported). 5、Support the computers (PC) data acquisition, Matlab analysis and processing. Plug it and  you can directly measured nuclear radiation. Features: For the detection of 20mR/h ~ 120mR/h of gamma rays and 100 ~ 1800 off variables / points of the soft beta ray. Sound and light alarm. Interrupt the output interface, through this interface can be connected to the microcontroller and then displayed on the LCD. Supports most of the Geiger tube: M4011, STS-5, SBM20, J305, etc. (the 330~600V operating voltage of the Geiger tube can be supported). Support the computers (PC) data acquisition, Matlab analysis and processing. Specifications: Geiger tube parameters: Technical parameters diameter: Φ10±0.5mm Total length: 90±2mm Starting voltage: < 350V Recommended operating voltage: 380V Minimum plateau length: 80V Maximum plateau slope: 10%/80V Operating voltage: 550V The maximum count rate: 25 times / min Medium temperature: -40 ~ 55 ℃ Item size: 118 * 63mm / 4.6 * 2.5in Package size: 130 * 80 * 50mm / 5.1 * 3.1 * 2.0in Package weight: 166g / 5.9ounce Packing List: 1 * Assembled Radiation Detector System 1 * Assembled Radiation Detector System