Characteristics: 1) Integration control, intellectualized operation 2) The LCD show makes it view more clearly 3) Touch the key lightly, make the operation more convenient 4) Blue light on blues back, is applicable to the daytime and nighttimes, which make the external appearance more beautiful 5) Alarm and vibration 6) 100 level of sensitivity lever can be regulated freely, after power fails it can recover former memory, more accurate detecting precision 7) Indicating the size of metal objects 8) The 24 hours system clock manifestation 9) Rechargeable, reminding at low electricity Parameter: 1) Use the standard 9V battery or rechargeable battery, recharge voltage alternating current 12 V frequency 50/60Hz 2) Power: 350mW 3) The working temperature: -15 ~ +60°C 4) Weight: 470g 5) Dimensions (L x W x H): 41 x 8.5 x 4.5cm