Specifications: Geiger Tube Model: M4011 Type-C interface power supplys: 5V1A Power consumption current: 20mA Tube M4011 Specification: Diameter: 100.5mm Total length: 902mm Starting voltage: Less than350V Recommended working voltage: 380V Minimum ping-length: 80V Maximum ping-slope: 10%/80V Extreme working voltage: 550V Maximum background count rate: 25 times / min Lifetimes: Greater than1 x 109 pulses Detection: X ray Material: plastic colour: As shown Package Contents: 1 x Radiation Meter Circuit Board set 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.