You can use this portable metal detector to detect the existence of small metal objects. This metal detector is a great help in the body search process for offensive objects in crowd control, airport and border security, checking packages for metal objects and anywhere hidden metal needs to be detected. Also used to search for coins, relics, jewelry, gold and silver anywhere, which can remind you of the presence of the metal object and let you know the location of it with sound and vibration alarm.Features:Detect metal objects in airports, stations, docks, customs and border defense for security inspection.Provides precise metal safety inspection with adjustable sensitivity.Three colors of indicators, green light for power, yellow light for low battery, red light for metal detection alarm.Easy to use with 2 alternative alert modes of audio signal indicator and vibrate indication.Portable and lightweight and easy to carry with a wrist strap.Rechargeable batteries socket to charge the product after installing the rechargeable batteries.Widely used for security check and detection of prohibited goods, electronic products, metal objects in station, border defense, school, court and factory.Features:Color: dark gray Material: ABS plastic Alarm indication:Bright yellow LEDs: a metal target has been detected Flashing green LED: power on Flashing red LED: low voltage indicator Alarm signal:Sound mode: Buzzer and Vibration-Mode Red LEDs: Vibration and red LED Detect objects: metal (handgun, dagger, steel ball, coins) Frequency: 22KHz Power Consumption: 270MW Max.Standby current: 8MA Reset Time: 0.5 seconds, automatically Distance detection:Brooch, iron nail: 30-60mm / 1.18-2.36inch Parts: 75-100mm / 2.95-3.94inch Handgun: 160-180mm / 6.30-7.09inch Six inch dagger: 160-170mm / 6.30-6.69 inch 20mm steel ball: 20-30mm / 0.79-1.18inch Working Voltage: 9V Batteries: 1 * 6F22 9V Batteries (not included) Working Temperature: -10 to +65 Package size: 380 * 80 * 38mm / 14.96 * 3.15 * 1.50in Package weight: 250g / 8.82oz Packing List:1*metal detector 1*English user manual