Feature: 1. Provide accurate security inspection of metal with adjustable sensitivity,light‑weight and easy to carry around with a wrist strap 2. 3 color of indicators, green light for power, yellow light for low battery, red light for metal detection alarm. 3. Easy to operate with 2 alternative alert ways of audio signal indicator and vibrator indication. 4. Rechargeable battery socket for charging the product after installing rechargeable battery. 5. Widely used for safety check and detection of prohibited goods, electronic products, metal objects in railway station, frontier defense, school, court and factory. Specification: Item Type: Metal DetectorMaterial: ABS PlasticAlarm Indication: Yellow LED Light: Metal target has been detected Flashing Green LED Light: Power on Flashing Red LED Light: Low voltage indicator Alarm Signal: Sound Mode: Buzzer and red LED Vibration Mode: Vibration and red LED Detect Objects: Metal(handgun, dagger, steel ball, coins) Frequency: 22KHz Power Consumption: 270MW maximum Standby Current: ＜8MA Reset Time: 0.5 seconds, Automatically Detecting Distance: Pin, Iron Nail: Approx. 30-60mm / 1.18-2.36inch Coins: Approx. 75-100mm / 2.95-3.94inch Handgun: Approx. 160-180mm / 6.30-7.09inch Six inch Dagger: Approx. 160-170mm / 6.30-6.69inch 20mm Steel Ball: Approx. 20-30mm / 0.79-1.18inch Operating Voltage: 9V Battery: 1 x 6F22 9V Battery (Not Included). Package List: 1 x Metal Detector