Specifications: Transimitter interface: RJ11, RJ45 Transimitter size: 60 * 135 * 30mm / 2.4 * 5.3 * 1.2in Transimitter battery: 3.7V, 1400mAh Receiver suitable cable: CAT5, CAT6 Receiver battery: 3.7V, 1400mAh Receiver standby current: 35mA Receiver current: max. 280mA Receiver size: 198 * 50 * 30mm / 7.8 * 2.0 * 1.2in Package size: 220 * 145 * 45mm / 8.7 * 5.8 * 1.8in Package weight: 400g / 0.9lb Features: After track the line, it can directly test the path, short circuit and break of the line sequence to improve the work efficiency. Strong signal, longer distance, anti-interference, no noise more accurate line tracer. Only one crystal heads can be tested, too. Withstand 60V high voltage, do not burn out electrical appliances. Observe the blinking frequency of the LED indicator on the switch or router to quickly locate the switch cable. Determining the telephone line status. USB Cable design, convenient for charging. Non-contact detection to ensure safety in operation. With LED lighting, also suitable for dark environment operation. Receiver knob switch, adjustable sensitivity.