•Low power consumption: Zero consumption in standby state and below 1mA in working state.

•High detecting speed: Time span between last alarming and next detecting is 0.1 second.

•Different alarming pitch can be achieved depending on distance with the detected metal objects (from weak to strong and high pitch).

•Working power supply: 6F22ND 9V battery

•Detecting distance: Objects with the size of a pin and 35mm away from the detector can be detected easily.