This instrument can be used for installation, inspection and maintenance of various cables. It enables checking cable break point, finding cable short circuit, identifying and tracing conductors without destroying the cable's insulation. Features: 2 models for option: MY6813/ MY6814, 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 destroying 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. Note: 1. Please read the user manual carefully before use. 2. Color and size may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Model: MY6813, without LED Light/ MY6814, with LED Light (Optional) Color: Black Material: ABS Tone Generator Output (Square Waveform): Single (1500Hz) or Dual (1300-1500Hz) Receive Frequency: 100Hz-300KHz Send Tone Frequency: 1.5KHz Power Supply: 2 * 9V 6F22 Battery (Not Included) Withstand Voltage: Less than 42V DC Voltage (Not for AC Voltage) Receiver Size: 210 * 43 * 26mm / 8.27 * 1.69 * 1.02in Emitter Size: 145 * 35 * 25mm / 5.71 * 1.38 * 0.98in Package Size: 28.3 * 12.7 * 4cm / 11.14 * 5 * 1.57in Package Weight: 287g / 10.12oz Package List: 1 * Receiver 1 * Emitter 1 * Tool Bag 1 * User Manual (English)