This Telephone Wire Tracker is easy to operate with smooth appearance. It's a multi-functional handheld cable testing tool to determine whether the cable line is continuous. It can identify the state in the working telephone line(clear,ring,busy). A professional safe tool for wireman.Features:Identify the state in the working telephone line(clear, ring, busy).Receive the tone signal on the cables or wires(telephone line).Judge continuity of the cables or wires without damaging the insulation.Send a single solid tone or a dual alternating tone to the object cables or wires.Track cable routes and identify where a line breaks.Perfect for installing, debuging, maintaining telephone line and other wires or cables.Specifications:Brand: BSIDEModel: FWT21Material: ABS PlasticColor: BlackAudio Signal: 1.5kHZReceiving Frequency Range: 100Hz-300kHz Receiver Battery: 1 * 9V 6F22 Battery (Not Included)Emitter Battery: 1 * 9V 6F22 Battery (Not Included)Receiver Size: 238 * 43 * 26mm / 9.4 * 1.7 * 1.0inEmitter Size: 145 * 35 * 25mm / 5.7 * 1.4 * 1.0inReceiver Weight: 72g / 2.5ozEmitter Weight: 65g / 2.3ozPackage Size: 28.3 * 12.5 * 4cm / 11.1 * 4.92 * 1.85inPackage Weight: 262g / 9.3ozPackage list:1 * Transmitter(FWT21 Sender)1 * Receiver1 * Carrying Bag1 * User Manual