Handheld Metal Detector Portable Vibration Buzzer Security Detection Alarm with LED Indicator Item Type: Metal Detector Battery: 1 x 6F22 280mAh rechargeable lithium battery (battery included) Battery Life: Continuous operation for more than 40 hours Alarm Mode: Vibration and buzzer double alarm Measuring Range: Within 12cm / 4.7in Detection Distance: 1. Pin: Approx. 30-50mm / 1.2-2in 2. Type 64 Pistol: Approx. 200mm / 7.9in 3. 6in Dagger: Approx. 250mm / 9.8in 4. 20mm Diameter Steel Ball: Approx. 120mm / 4.7in Alarm Indication: Flashing Green LED: Power on Flashing Red LED: Target detected Continuous Yellow LED: Low voltage indication Metal Indicator LED: The indicator light changes from green to red due to different sizes of detected objects Alarm Signal: Sound Mode: Buzzer and red LED, metal indicator LED Vibration Mode: Vibration and red LED, metal indicator LED Power Consumption: Maximum 270MW Working Frequency: 22KHZ Standby Current: <5MA Working Temperature: -10℃-65℃ Reset Time: 0.5s, Automatic