Product parameters: Detection of a dollar coin sensitivity distance of 3.5-5cm, with under-voltage indication function. Detection mode: vibration, light alarm Power supply: 9V battery (shipped without battery) Working environment: temperature -20-60 Package size: 24*5*5cm The product has a high stability performance and high sensitivity design, detection surface for 360 all-round detection, easier to find contraband, product design humane, with special charm accessories, the body is small and easy to carry, the front section of the instrument detection head with a high brightness LED light, in the case of insufficient light can be used as a lighting tool. The instrument does not require adjustment and is easy to use. Equipped with a low voltage indication function, when the instrument is used under voltage, the middle LED light will flash, mentioning that the battery should be replaced with a new one.