Fuction: Perfect for installation, debugging, maintenance of telephone line and other wires or cables. It can trace the cables or wires and diagnose the break point. Receive the tone signal on the cables or wires (telephone line). Sends a single solid tone or alternating dual tone to object cables or wires. Compatible with all common trace tone sources. Identify working phone line status (clear, ringing, busy) Save time and be safe: thanks to the sound signal, you will quickly track your cable and you won't have to take the risk not knowing exactly where your wires are. Yellow color. Material: ABS + metal. The RJ11 connector allows you to easily test telephone systems. This wire tracer and circuit tester - including transmitter / tone generator and detector - is designed to identify and trace wires or cables without damaging the insulation. Note: Requires 2 x 9V batteries (not included) Note: DO NOT connect to a live circuit. The sensing probe can be used with live circuits but should NOT be allowed to touch a live wire under any circumstances. Package Quantity: 1 set