Highly sensitive, it can easily detect pin-sized metal articles
Its sensitivity can be adjusted according to the on-site requirements
Indication of low battery voltage (LED light is always on)
There are two kinds of alarms, including sound & light and vibration
Working power supply:6F22ND 9 V battery (alkaline battery, rechargeable battery), rechargeable battery should be taken out and recharge (the price not included the charger and battery).