1. 5V power supply, or 1.5V 3 batteries; 1.2V 4 batteries, current: 30mA - 12mA 2. Used to detect gamma rays from 20mR/h~120mR/h and 100~1800 off Variation/spot/cm 2 of soft beta rays. 3. Sound and light alarm; Compatible with for 4. Interrupt output interface, through which you can connect The microcontroller is then displayed on the LCD. 5. Support most Geiger tubes: M4011, -5, SBM20, J305, etc. (Can support Geiger tube 330~600V working voltage).Support computer (PC) data acquisition, Matlab analysis and processing compatible: (recommend for R3, or any other arbitrary with 5V and external interrupt ) Internet Downloadable: SPI Example for Radiation Logger Logger Radiation can be used as a host computer software to build a radiation monitoring station. Product Description: Name: Radiation Detector System Geiger tube parameters: Technical parameters Diameter: Φ10±0.5mm Total length: 90±2mm Starting voltage: Less than350V Recommended working voltage: 380V Minimum platform length: 80V Maximum platform slope: 10%/80V Limit working voltage: 550V Maximum counting rate: 25 times/min : 1 x 10^9 pulses Medium temperature: -40~55℃ size: 10.8 x 6.3 x 2cm Material: ABS colour: blue Package Contents: 2 x DIY Geiger Counter Kit 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.