Item Type: Wire Tracer Material: ABS Power Specifications: DC, 9V Laminated Battery x 2 (Battery Not Included) Signal Transmission Format: Multi Frequency Pulse Test Cable: Twisted Pair Cable, Telephone Line, Video Line, Common Metal Wire, Network Cable Testable Interface: RJ11, RJ45 Signal Output Level: 8Vp p Signal Transmission Distance: 1 to 3000 Meters / 1.1 to 3280.8 yd 1. Cable Testing: This wire tracer can test the physical connection status of network cables, such as open circuit, short connection, miswire, and reverse physical connection. 2. Support Earphone: This circuit tracer is equipped with a headphone jack. You can connect a headphone to receive clear signals in noisy environments. Adjust the volume knob to maintain appropriate volume and reduce interference. 3. Wide Application: This Ethernet tester is suitable for tracing RJ11, RJ45, network cables, telephone lines, single wires, and metal conductors. Use the emitter to test telephone line status, such as identifying TIP or RING lines. 4. Hard Shell: This network cable tester features a smooth design and flexible interface, constructed from sturdy and durable ABS material for enhanced protection. 5. Necessary Tool: This wire tracer is an essential testing tool for telecommunication, wiring, and network maintenance professionals. Package Includes: 1 x Wire Tracer Set (2 Pieces) 1 x User Manual 1 x Earphone Cable