Specifications:- · Advantage: Extremely Perfect In Anti-shock. · Dimension Of Unit: 375* 750 * 35 Mm (l*w*h) · Net Weight Of Unit: 225g · Operate Frequency: 22 Khz · Operating Temperature: -5 to +55??? · Operate Current: < 50ma · Power: 9v (6f22) Alkaline Battery ,operate Voltage 7v-9v · Charging Indications. Alarm: · Led,VIBRATION & Audio. · Sensitivity Adjust Knob. · High Sensitivity: Detect Pin At 30mm; 25cent Coin At 75mm · Low Sensitivity: Detect 64gun At 18cm; 6 Inches Knife At 18cm