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:Scanner Condition: Power supply: rechargeable battery power waste: 270mW Working frequency 22KHZ Standby current:Less than 5MA Working voltage: DC 7-12V Working temperature: -10-+65 Colour:Black Material:Plastic Package Contents: 1 x Scanner 1 x 12V1ACharger 1 x 9V long UV charging station 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.