Portable Hand-Held Security Metal Detector (GP 3003B1)(Black) 1) Highly sensitive 2) Simple and convenient to use, no adjustment is required; 3) The detection distance will not be changed when the battery voltage drops from 9V to about 7V; 4) Low power consumption, can work for 40 hours continysly; 5) There is automatic and continues alarm when the battery is used up; 6) Switch on off audio prompt function; 7) Witch external rechargeable socket hole; 8) Has audio, light and vibration hand off switch 9) Detection Distance: - Pin: 30-60mm - 64 model handgun: 150mm - Diameter: 20mm - Steel ball: 90mm 10) Install the 6F22 15F8H(9V) battery (not included) 11) Power: 270MW 12) Alarm: Vibration and sound and light alarm simultaneously 13) Detection sensitivity: As detect one yuan coin, the detection distance ≥ 5cm 14) Features and Applications: Scanning area is large, stable, durable, suitable for less demanding sensitivity school and factory security tests 15) Current work: sound and light is less than 47mA, vibration less than 103mA 16) Dimensions: 415mm x 85mm x 45mm