This Cable Tracker is designed to identify and trace wires or cables within a group without damaging the insulation. For telephone lines, it can detect line states such as clear, ring, and busy. This tool makes installing, debugging, and maintaining telephone lines more convenient. The kit includes a Sender and Receiver.Color: Yellow Material: ABS + Metal Applications: - Testing polarity of phone lines - Tracing individual wires - Locating wires buried behind drywall - Checking cable continuity - Identifying cable breaks or interruptions - Compatible with common tracing tone sources - Tracking cables and diagnosing break points - Receiving tone signals on cables or wires (telephone lines) - Sending a single solid tone or dual alternating tone to target cables or wires Receiver Features: - On/Off button - Test button - 3.5 mm earphone jack Sender Features: - Tone/Off/Cont (Continuity) switch - Tone/Cont (Continuity) indicator LEDs - Red and black test lead cables (61 cm, approx.) - Built-in RJ-11 telephone cable (47 cm, approx.) Receiver Dimensions: 23 x 4 x 23 cm (H x W x D, approx.) Sender Dimensions: 65 x 56 x 21 cm (H x W x D, approx.) Battery: 9V (6F22), not included Package Contents: - 1 x Cable Tracker Sender - 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 is +/- 1-3 cm.