Features: 100% brand new and high quality For cable network telephone line RJ wire tracking For better installation maintenance debug of the telephone line. Emitter and receiver are included Judge continuity of the cables or wires Track the cables or wires and diagnose the break point Receive the tone signal on the cables or wires (telephone line) Identify the state in the working telephone line (clear ringing busy) Send a single solid or a dual alternating tone to the target cables or wires. Specifications: Send tone frequency: 1.5kHz Receive frequency: 100Hz~ 300kHz Power Supply: 9V 6F22 (not included) Receiver Size: 215mm x 43mm x 23mm Emitter Size: 119mm x 60mm x 29mm Material: Plastic Main Color: Black Bag Size: approx. 215 x 13.5 x 5cm Net Weight: 351g Package Included: 1 X Emitter 1 X Receiver 1 X Headphone Cable 2 X Test Cables 1 X Canvas bag