Thedose rate alarm value and the metering alarm threshold can be set by pressing the button. With over-dose alarm function. Thedose rate is measured in real time, stableperformance, high accuracy. Small size and compact, , easy to carry with, fit for indoor, outdoor, home, hotel, etc. Built-in rechargeable battery, Type-C port, which can be used for long time after being fullycharged. Highdefinition display, the display is clearer, and it can be displayed normally at night. color: Black Material: aluminum alloy Package Contents: 2 x Nuclear Radiation Detector 2 x USB cable 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.