Check the listing for details. BSIDE FWT21 Telephone Line Detector Finder Network Cable Wire Test Q5E1. Condition: New. Listed at 24.06 USD. This Telephone Wire 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,,busy). A professional & tool for wireman. Features: Identify the state in the working telephone line(clear, , 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 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 Color: Black Audio Signal: 1.5kHZ Receiving Frequency : 100Hz-300kHz Receiver : 1 * 9V 6F22 (Not Included) Emitter : 1 * 9V 6F22 (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 * (FWT21 Sender) 1 * Receiver 1 * Carrying Bag 1 * User Manual