The radio frequency tracer is useful in locating stuck transmitters or bugging devices in a room or automobile. It excels at silent detecting RF signals for RF security and counter-surveillance applications. Supplied as a complete with internal NiCd pack, AC wall charger, short rubber antenna and earphone. Frequency range 1 MHz – 6 GHz Weight 230 gm Size 100 x 68 x 31 mm Impedance 50 Ohms ( BNC Socket) Casing Stamped Aluminum Battery 5 x AA 600 mAH Ni-Cd pack Power 9 Volts DC , 300Ma Time-base Less than 1 PPM at room temperature