The product has high stability performance and high sensitivity design. The detection surface is 360 all-round detection, which makes it easier to detect contraband. The product design is user-friendly, equipped with special hanging accessories, and the body is small and easy to carry. Bright LED light can be used as a lighting tool in low light conditions. The instrument does not need to be adjusted, and the operation is simple. It is equipped with a low voltage indication function. When the instrument is under voltage, the mid-end LED light will flash, and the battery should be replaced with a new one. Product parameters: 1. The sensitivity distance for detecting one-yuan coins is 3.5-5cm, and it has the function of undervoltage indication. 2. Detection method: vibration, light alarm. 2. Power supply: 9V battery (without battery) 3. Working environment: temperature -20-60. Size: 23*4*4cm