Function: Very suitable for installing, debugging and repairing telephone lines and other wires or cables. It can trace cables or wires and diagnose breakpoints. Receive audio signals through cables or wires (telephone lines). Send a single tone or alternate dual tone to the cable or wire object. Compatible with all common tracking audio sources. Identify telephone line working status (clear, ringing, busy) Save time and ensure security: Thanks to the sound signal, you can quickly follow the cable without risking not knowing the exact location of the wire. yellow. Material: ABS + metal Scope of delivery: 1 set Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received Delivery quantity: (according to the main picture)