You can use this hand held metal detector to detect the existence of small metal objects. This metal detector is a nice helper in the process of body search for offensive objects in crowd control, airport and border security, checking parcels for metal objects and anywhere that hiddened metal needs to be detected. Also used for searching coins, relics, jewelry, golden and silvery everywhere, which can remind you the presence of the metal object and inform you of the location of it with sound and vibrations alarm.   Features: Detect the metal objects at airports, railway stations, wharfs, customs and frontier defense for security inspection.  Provide precise security inspection of metal with adjustable sensitivity.  Three color of indicators, green light for power, yellow light for low batterys, red light for metal detection alarm.  Easy to operate with 2 alternative alert ways of audio signal indicator and vibrators indication.  Handheld & light-weight and easy to carry around with a wrist strap.  Rechargeable batterys socket for charging the product after installing rechargeable batterys.  Widely used for safety check and detection of prohibited goods, electronic products, metal objects in railway station, frontier defense, school, court and factory.   Specifications: Color: Dark Grey;  Material: ABS Plastic;  Alarm Indication: Yellow LEDs Light: Metal target has been detected;  Flashing Green LEDs Light: Power on;  Flashing Red LEDs Light: Low voltage indicator;  Alarm Signal: Sound Mode: Buzzer and red LEDs;  Vibration-Mode: Vibrations and red LEDs;  Detect Objects: Metal(handgun, dagger, steel ball, coins);  Frequency: 22KHz;  Power Consumption: 270MW Max.;  Standby Current: ＜8MA;  Reset Time: 0.5 seconds, Automatically;  Detecting Distance: Pin, Iron Nail: 30-60mm / 1.18-2.36inch;  Coins: 75-100mm / 2.95-3.94inch;  Handgun: 160-180mm / 6.30-7.09inch;  Six inch Dagger: 160-170mm / 6.30-6.69inch;  20mm Steel Ball: 20-30mm / 0.79-1.18inch;  Operating Voltage: 9V;  Batterys: 1 * 6F22 9V Batterys (Not Included);  Operating 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