This Cable Tracker is designed to identify and trace wires or cables within a group without damaging the insulation. It can detect various line states, making installation, debugging, and maintenance of lines more convenient. The set includes a S and Receiver. Color: Yellow Material: ABS + Metal Applications: - Testing polarity of phone lines - Tracing individual wires - Locating wires buried behind drywall - Testing cable continuity - Identifying cable interruptions - Detecting breaks in cables - Working with common tracing tone sources - Monitoring cable or wire continuity - Tracking cables or wires and diagnosing faults - Receiving tone signals on cables or wires - Identifying line states (clear, ring, busy) - Sending a continuous tone or dual alternating tone to target cables or wires Receiver Features: - On/Off button - Test button - 3.5 mm headphone jack S Features: - Tone/Off/Cont (Continuity) switch - Tone/Cont (Continuity) indicator LEDs - Red and black test lead cables (approximately 61 cm) - RJ-11 cable (approximately 47 cm) Dimensions: - Receiver: 23 x 4 x 2.3 cm (H x W x D, approximate) - S: 6.5 x 5.6 x 2.1 cm (H x W x D, approximate) Power: 9V battery (6F22), not included Package Contents: - 1 x Cable Tracker S - 1 x Cable Tracker Receiver - 1 x Carrying Pouch - 1 x English User Manual Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.