... without damaging the insulation. For telephone line, it can identify some states in the line, and more convenient to install, debug ... on the cables or wires (telephone line).· Identify the state in the working telephone line (clear, ring, busy).· Send a ... Size: Receiver 238x43x26mm; Emitter 145x35x25mm· Wight: Receiver 106g (including battery); Emitter 114g (including battery) MS6812 LINE TRACKER