Features: WIRE TRACKER SET: 1 x wire tracker transmitter, 1 x wire tracker receiver, 1 x RJ45 adapter cable, 1 x RJ11 adapter cable, 1 x RJ11-crocodile adapter cable, 1 x carrying bag are contained. PRECISE WIRE TRACING: The line finder, strong anti-interference, fast & accurately finds the required line among numerous wires, suitable for RJ11 (like telephone line) & RJ45 (like network line)interface cable, other metal wire. LINE TEST: The device can detect wire sequence and calibrate, test whether line voltage exists or not, judge which line voltage polarity(positive or negative), examine whether short circuit happens or not. HEADPHONE JACK & LED LIGHT: It equips with 3.5mm audio port, enabling earphone connection(volume control available) to get information in a noise environment, LED auxiliary light allowing operation in darkness. WIDE APPLICATION: Multifunctional wire tracker is suitable for daily network communication maintenance, integrated cabling network engineering, monitoring line repairing, etc. Specifications: Material: ABS Transmission Signal Distance: >1km Display: LED Flash Light: Yes Operating Temperature: -10~40C (14~104F) Operating Humidity: 10~95%RH Storage Temperature: -10~40C (14~104F)