Features: Works perfectly when RJ11 RJ45 cable is on power. Trace RJ11, RJ45, cables or other metal wire (via adapter). Easy and fast to locate the breakpoint without opening the wire\u0026#39;s cover. Network cable collation: judge short-circuit, breaking circuit, open circuit and crossing. Test line level, positive and negative polarity. Status of telephone line checking: test the working status of telephone line(idle, ringing, and off-hook) and judge TIP and RING line. Check wire continuity. Specifications: Color: Blue Material: Plastic Work Temperature: 0~40\u0026deg;Cthe maximum 80% relative humidity(no coagulation) Storage Temperature: -10~50\u0026deg;C, the maximum 80% relative humidity [no coagulation, no battery] Altitude: 2000 meters Anti-explosion Rating: IP40 Distance of Sending Signal: 100 meters Battery(NOT Included): Emitter: 1*6F22\/9V Battery; Receiver: 1*6F22\/9V Battery Emitter Size: 12.6*6.4*3cm\/4.96*2.52*1.2in Receiver Size: 20.5*4*3cm\/8.07*1.57*1.2in Package Size: 22*10.5*3.5cm\/8.66*4.13*1.4in Package Weight: 240g Package List: 1xEmitter 1xReceiver 1xClip Adapter Cable 1xRJ45 Cable 1xUser Manual (English)