Versatile Wire Tracing: Quickly identify and trace the target cable from a bundle without damaging the insulation—ideal for locating RJ11 and RJ45 cables. It also supports tracing other metal wires, such as electrical and speaker lines, using the included alligator clip adapter. Note: Be sure to power off the cable before tracing metal wires to avoid damaging the device. Comprehensive Cable Mapping: Use the transmitter and receiver together to perform pin-to-pin cable mapping and verify the physical status of network cables. Detects open circuits, shorts, miswiring, and reversals. LED indicators display wiring sequences clearly, and the system supports testing over long distances up to 300 meters. Telephone Line Testing & Continuity Check: Independently test telephone line status—detect idle, ringing, or busy states, and determine TIP or RING lines using only the transmitter. Also functions as a continuity tester to check cable integrity, line levels, and polarity for more accurate diagnostics in telecom and low-voltage applications. Adjustable Volume & LED Flashlight: Fine-tune the receiver’s volume using the built-in control knob for optimal signal clarity and minimal interference. This is especially useful when tracing cables in noisy or dense wiring environments. An integrated LED flashlight enhances usability in low-light or hard-to-reach spaces. Complete Kit with 3-Year Warranty: Everything you need is included: transmitter with RJ11/RJ45 ports, receiver with BNC interface, RJ11 alligator clip adapter cable, RJ45 cable, two 9V batteries, and a detailed user manual—all backed by a 3-year warranty for peace of mind and long-term performance.