This tester is a multi-functional wire tracker, including cable emitter and receiver. It has functions like telephone wire tracking, network wire tracking, power cable tracking, network wire check, etc. and it produces fast and accurate measurements. It is a necessary testing tool for telecommunication engineering, wiring engineering and network maintenance person. Features: Can test telephone wire, network wire, power cable. Can test the line level, positive and negative polarity by using emitter only. Equipped with RJ11 cable and with BNC/RJ45 interface. Network wire checking function to judge normal/short-circuit/open-circuit/crossing and reverse connection. Easy and fast to locate the breakpoint without opening the wire's cover. Includes low battery indication function. Protected by a bag, portable to carry. Specifications: Material: ABS Color: Grey #43; Blue Compatible Connectors: RJ11, RJ45 Short Circuit/Open Circuit Detection: Yes Distance of the Emission Signal: gt;300m Altitude: less than 2000m Classification: IP40 Safety Class: IEC61010-1 600 V CAT III, pollution class II. Power Supply: Emitter: 1 * 9V 6F22 Battery; Receiver: 1 * 9V 6F22 Battery (both NOT included) Operating Temperature: 0~40C(32~104F), 80%RH Storage Temperature: -10~50C(14~122F), 80%RH Emitter Size: Approx. 17.5 * 4.5 * 3.5cm / 6.89 * 1.77 * 1.38in Receiver Size: Approx. 12 * 4.8 * 3.4cm / 4.72 * 1.89 * 1.34in Emitter Weight: Approx. 75g / 2.65oz Receiver Weight: Approx. 67g / 2.36oz Package Size: Approx. 21.7 * 11.4 * 4.9cm / 8.54 * 4.49 * 1.93in Package Weight: Approx. 270g / 9.52oz Package List: 1 * Emitter 1 * Receiver 1 * RJ11 Cable 1 * Crocodile Clip Test Line 1 * Carry Bag 1 * User Manual (English)