[Design] Radiation dosimeter is easy to use, intuitive, small size Dia 5/8 inch x L 4 1/8 inch(15.3mm x 108mm), portable, and handy tube. Audible and visual alarm. High sensitivity, measuring range 0.05uSV-50mSv.High-power rechargeable battery, Tiny Pen Shape Inspiration with TYPE-C interface, screen sleep lasts for 50 hours measurement. [Application] Geiger counter radiation detector can detect the radiation level of any environment such as living, medical, high-risk environment, and any object at any time, such as detecting radiation of toys, antiques, building materials, furniture, decorations, food, etc, and personal protection, who are exposed to radiation such as supervisors, pregnant women, etc, health insurance and a good gift for a friend. [Function] The Geiger radiation detector can detect beta rays, gamma rays and X-rays almost instantaneously, and the radiation dose data is updated in real time every second. The electric radiation detector has an excellent detection range of 0.01-999 uSv/h. This range can be used to detect up to 999 Sieverts or 99,900 rem. and geiger counter with OLED display. Smart, bright, energy saving, safe. [How works]Geiger counters are designed according to the principle of the ionization properties of rays to gases. Technological advancement, now, you can put this compact tube size and dual mode Geiger counter/dosimeter in your pocket, just flick the switch, maybe it will help you avoid unseen harm. material: plastic Color as shown Package Contents: 2 x Personal 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.