Cable tracers are designed to identify and trace wires or cables within a group without damaging the insulation. This telephone cable tracing system consists of a tone generator and a probe that allows you to find where the cable is routed and if (and if so, where) there are any breaks in the line. It can also identify the status of a working phone line so you can determine if the line is idle, ringing or connected, all without any interference or damage to the cable installation. benefit?: Determining cable or wire continuity Finding and diagnosing breakpoints Send a single, pure tone to the cable Tells you the status of an idle, ringing, or busy phone line Safely inspect cables without interrupt cable installation High quality tool with volume sensitivity control Ready to use - just plug in the battery and you're done Easily install, commission and maintain one or more telephone lines around your home or your desktop with this high quality tracking system Specification Net weight: 0.33kg with battery, 0.26kg without battery Single package size: 26 x 12.5 x 4cm Power supply: 2 x 9V batteries (delivered without batteries) Connector: RJ-11 (for telephone socket) Includes: transmitter, receiver, test leads, carrying bag and manual