Professional Radiation Dose Alarm Instrument: adopts counter tube, it is mainly used to monitor X, Y, and rays with highly sensitivity and accurate measurement.OLED display screen: display the instantaneous dose, average dose and cumulative dose rate clearly, visual in night.Easy to Use: one button startup and test automatically, and with audible and visual alarm if the test is over the limit.Rechargeable & Reusable Battery: Built in lithium battery power supply, power saving and durable.Super Mini Size: with 0.7oz lightweight and the size as small as a lipstick, the nuclear radiation detector is very convenient to carry.Sensor: 48mm Geiger counter tubeMeasure Range: 0.05uSv-50mSvMeasure Precision: -17% ~+25% based on 137CsyCharging Time: 2-3 hoursAlarm Responding Time: Less than 10sBattery: 3.7V, 300mAh lithium batteryWorking Environment: Temperature -20~50, humidity Less than95%RH without dewColour:Yellow+whiteMaterial:plasticPackage Contents:1x Geiger Counter1x Type-C CableOnly 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.