This instrument can be used for installation, inspection and maintenance of cables. It enables checking cable break point, finding cable short circuit, identifying and tracing conductors without the cable's insulation. The probe has LED light. Consists of a receiver with flexible probe and a emitter with 2 alligator clips. Check cable break point, find cable short circuit, identify and trace conductors without the cable's insulation. Receive the tone signal on the cables (telephone line). Identify the state in the working telephone line (clear, ringing, busy). Send a single solid or a dual alternating tone to the target cables. With 3.5mm earphone jack, it can be connected with a pair of earphone (not included) to help you to work well in noisy environment. Multi-function cable tracker is suitable for automotive repair, telephone line maintenance and more cables repair. Tone Generator Output (Square Waveform): Single (1500Hz) or Dual (1300-1500Hz) Receive Frequency: 100Hz-300KHz Send Tone Frequency: 1.5KHz Withstand Voltage: Less than 42V DC Voltage (Not for AC Voltage) Color: As Shown Material: plastic Package Contents: 1 x Automotive Car Cable Kit(Without 2x9V batteries,You need to prepare yourself) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.