Metal Detector Wand Handheld Security Sound Vibration Alerts High Sensitivity Safety Bar Item Type: Metal Detector Wand Battery: 1 x 6F22 280mAh rechargeable lithium battery Battery Life: More than 40 hours of continuous operation Frequency: 95KHz Alarm Mode: Vibration and buzzing double alarm Measuring Range: Within approx. 12cm / 4.72in Detection Distance: 1. Pin: 30~60mm 2. Type 64 Gun: 150mm 3. Six Inch Knife: 160mm 4. 20mm Diameter Steel Ball: 90mm Features: 1. High sensitivity 2. Easy e, convenient, no adjustment 3. 9V battery is reduced to about 7V, and the detection range remains the same 4. Power saving, can work for more than 40 hours continuously 5. Two alarm methods of sound and vibration 6. A continuous sound or vibration alarm is generated when the battery is used up 7. There are startup, shutdown sound or vibration prompt function 8. There are two kinds of sensitivity, high and low