BSIDE Telephone Line Detector Line Finder Network Cable Tester RJ11 Tester Continuity Test FWT21 Wire Tracker Cable Tracker Tone Generator Wires Trace Diagnose the Break Point with Carrying Bag MS6812 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: BSIDE Model: FWT21 Material: ABS Plastic Color: Black Audio Signal: 1.5kHZ Receiving 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 * 1.0in Emitter Size: 145 * 35 * 25mm / 5.7 * 1.4 * 1.0in Receiver Weight: 72g / 2.5oz Emitter Weight: 65g / 2.3oz Package Size: 28.3 * 12.5 * 4cm / 11.1 * 4.92 * 1.85in Package Weight: 262g / 9.3oz Package list: 1 * Transmitter(FWT21 Sender) 1 * Receiver 1 * Carrying Bag 1 * User Manual