MASTECH MS6812 Telephone Network Cable Electric Wire Finder Tracker. The cable tracker is designed to identify and trace wires or cables in a bunch without damaging the insulation. For telephone line, it can identify various states of the line, and make it more convenient to install, debug, and maintain. Features: Rapidly trace the target wire among plenty of wires; Quick continuity test of cables and wires; Easy diagnosis of break point of cable and wires; Identify the status of working telephone line (clear, ring, busy); Sound and LED signal indicators; Adjustable volume of sound signal. Specification: Send tone frequency: 1.5KHz; Receive frequency range: 100~300KHz; Power supply: 6F22 (9V); Receiver size: 23.8 x 4.3 x 2.6cm; Emitter size: 14.5 x 3.5 x 2.5cm; Receiver weight: 106g; Emitter weight: 114g.