1.Detect X-ray, Y-ray, and β-ray. 2.High sensitivity,can work in various environments. 3.The LCD has a display function and the status display is clear at a glance. 4.Vibration/sound combination alarm methods. This product uses a Geiger- counter. Counter for detecting the intensity of ionizing radiation(Beta particles,Gamma rays, and x-rays).Use a gas tube or a small chamber as a probe. When the voltage applied to the probe reaches a certain range. Each time the ray is ionized in the tube to produce a pair of ions, it can be amplified to produce an electric pulse of the same size. And recorded by the connected electronic device. The number of rays per unit of time was thus measured. Color: As Shown Material: plastic Package Contents: 1 x Host 1 x Storage Bag 1 x English instruction manual 1 x Charging 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.