Item Type: Network Cable Tester Model: TM-9 Material: ABS Maximum Working Current: Transmitter: 10mA; Receiver: 30mA. Signal Transmission: Multiple Audio Pulses Signal Output Frequency: 8Vp-p Signal Transmission Distance: 3km Wire Testing: For twisted pair, video cable, telephone cable, ordinary metal wire. Wire Testing Port: RJ11 for telephone line, RJ45 for network line. Transmitter and Receiver Power Supply: 1 x 9V 6F22 lithium battery, shipped without battery. Applications: For telecommunications network line engineering and daily maintenance, computer network line engineering, and other metal wire line engineering and maintenance work. Function: 1. Telephone line search function. 2. Network line search function. 3. Power cable search function. 4. Network wire sequence proofreading function. 5. Line status testing function. 6. Low voltage prompt function. 7. Headphones and volume adjustable. 8. Lighting function. 9. You can find the cable when connecting to an Ethernet switch, router, or PC terminal and turning it on. Description: This line finder is a multi purpose communication line checker designed using unique data transmission. It has three major functions of line finding, line alignment, and line status testing. It is fast and accurate, and is a practical tool for communication line installation and maintenance engineering technicians. Widely used in telephone systems, computer networks, and other situations involving metal wire lines.