... face (front) of the transmitter has Seven LED’s (channel indicator lights for Copper, Silver, Gold, P.T, Tin, Jewel, ... 500m, 600m, 700m, 800m, 900m, 1000m) showing 10 different detecting range. And has one knob for selecting the detecing RangeAlso, the ... Flags(9) Operators ManualSpecifications:(1) Max Detection: 50m(2) Detect Range: 1000m(3) Rechargeable Battery: Continuous working 72 hours(4) Power ...