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 wireand 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: 0-40anddeg Cthe maximum 80 percent relative humidity(no coagulation) Storage Temperature: -10-50anddeg C, the maximum 80 percent relative humidity [no coagulation, no battery] Altitude: 2000 meters Anti-explosion Rating: IP40 Distance of Sending Signal: 100 meters Battery(NOT Included): Emitter: 1x6F22 or 9V Battery Receiver: 1x6F22 or 9V Battery Emitter Size: 12.6x6.4x3cm or 4.96x2.52x1.2in Receiver Size: 20.5x4x3cm or 8.07x1.57x1.2in Package Size: 22x10.5x3.5cm or 8.66x4.13x1.4in Package Weight: 240g Package List: 1xEmitter 1xReceiver 1xClip Adapter Cable 1xRJ45 Cable 1xUser Manual (English) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.