Usage method: Push the power switch (8); a "click" or vibration means power is on (green light). No sound/vibration indicates no battery or poor contact. Continuous alarm means battery needs replacing.After startup, hold the handle to scan. Alarm and red light indicate metal detection; stop scanning to silence alarm and revert to green light.For low sensitivity: Press and hold switch (3) to ignore small metal objects. Alarm and red light indicate larger metal detection; stop scanning to revert to green light.1. Safety detection and inspection of stations, sports venues, and 2. Security inspections of examination rooms, public security, schools, and security departments.Reminder:This product cannot be used to measure broken nails in wood, plastic , gold and silver jewelry, colored or rare metals.Type:ScannerCondition:Power supply: rechargeable batterypower waste: 270mWWorking frequency 22KHZStandby current:Less than 5MAWorking voltage: DC 7-12VWorking temperature: -10-+65Colour:BlackMaterial:PlasticPackage Contents:1 x Scanner1 x 12V1ACharger1 x 9V long UV charging stationOnly 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.