STRONG SENSITIVITY:Metal detector wand can detect even small hidden metal objects, theres a distinctive audio tone and vibration to remind you, which is very suitable for checking metal objects. AUDIO/VIBRATION TWO MODES: Sound & vibration mode, suitable for all occasions. Depends on the needs, vibration function should be used in noisy situation or in places where the operator does not wish for the sound to be heard in his surrounding area. ADJUSTABLE SENSITIVITY: Press the low sensitivity switch during detection, detector will only respond to bigger metal objects such as knife, hand gun etc and will not respond to small metals such as ring, key, coin, pin etc. Do not release the low sensitivity switch until you complete low sensitivity detection. POWER OPERATED: Powered by one 9V battery standard (Not included) or rechargeable battery (Not included). With one external charging port, the battery charger is not included. Please avoid charging it when you have no rechargeable battery, otherwise it can& 39;t work normally. And please turn off the detector when charging it. COMFORTABLE HANDLE & WIDELY USE: Portable metal detector wand, lightweight design and comfortable handle grip make it easy for long time use. It comes with a belt clip, make it portable and convenient. Good for security, indoor/outdoor events, such as airport, schools, train station, subway, sports events, exhibition center, anywhere you need metal detection.