Tone Generator and Probe - Multipurpose Wire Tone Generator.Tone Generator and Probe features include: Identifies the state of the working telephone line (clear, ring, busy) within a group Designed to identify and trace wires or cables without damaging insulation Identifies polarity of a telephone line Trace &: identify wires in a bundle, at a cross-connect point or remote end Can identify split pairs when one wire from a pair has been terminated Used to send or trace a tone Use on twisted pair wiring (telecom/datacom), single conductors, coaxial cables, de-energized AC wiring, &: most other wiring The probe identifies the signal from the tone generator through drywall, wood &: other non-metallic materials Continuity test Adjustable sensitivity/volume control to increase accuracy Recessed On/Off button prevents battery drain. Send tone frequency: 1.5KHz, Receives frequency range: 100 thru 300 KHz Size: receiver 9.4": x 1.7": x 1in, , emitter 5.7": x 1.4": x 1in, Power: 6F22(9V)x1 Order Qty of 1 = 1 Piece Below is more info on our Tone Generator and Probe