Main Tech Parameter:

Emitting Frequency: 6.99KHz

Signal Frequency: 437Hz

Sensitivity:      small coil 25-30cm(test 25 US cent)

                      big coil 35-40cm(test 25 US cent)

max Detection:   small coil 1.5 meters

                         big coil 3.0-3.5 meters

                         60cmx60cmx1cm aluminium sheet

power Supply:   8*1.5V AA batteries (attach external battery box and bag)

weight:             2.875Kg