FEATURES:The MS6812 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. There is a transmitter (MS6812-T) and a receiver (MS6812-R) included in the cable tracker. Functions: Judge continuity of the cables or wires 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 SPECIFICATIONS: Send tone frequency: 1.5kHz Receive frequency range: 100 ~ 300kHz Power supply: 6F22 (9V) Receiver size: 9 ½ x 1 ¾ x 1 inch Transmitter size: 5 ¾ x 1 ½ x 1 inch Receiver weight: 4 Oz (including battery) Transmitter weight: 4 Oz (including battery) What is in the box: Transmitter Receiver 9V battery x 2 Pouch