The cable tracker is designed to identify and trace wires or cables within a group without damaging the insulation. For telephone line, it can identify some state in the line, and more convenience to install, debug, maintain telephone line.Features:Perfect for installing, debuging, maintaining telephone line and other wires or cables.Detect continuity of the cables or wires without damaging the insulation.Track the cables or wires, and diagnose the break point.Receiver the tone signal on the cables or wires (telephone line).Identify the state in the working telephone line (clear, ring, busy).Send a single solid tone or a dual alternating tone to the object cables or wires.Include a sender (MS6812-T) and a receiver (MS6812-R).A professional & safe tool for wireman.Specifications:Send tone frequency: 1.5kHzReceive frequency range: 100 ~ 300kHzPower supply: 6F22 (9V)Receiver size: 23.8 x 4.3 x 2.6cmEmitter size: 14.5 x 3.5 x 2.5cmReceiver weight: 106g (including battery)Emitter weight: 114g (including battery)Package size: 25.5 x 12 x 4cmPackage weight: 371g