This wire tracker is capable of finding out the line breakpoints precisely without opening line cover, including short circuit, broken circuit and overcurrent. For telephone line, it can identify some state in the line, and more convenience to install, debug, maintain telephone line. It is suitable for RJ11 and RJ45. Features: Line Tracing: Rapidly find the target wire from among plenty of network, telephone wires. Line Detection: Automatic efficiently scan for the miss wiring, disorder cable, short circuit, broken circuit and other breakpoints. It comes with an earphone support to enable service technician to work conveniently and comfortably in noisy environment. Receiver the tone signal on the cables or wires. (telephone line) Identify the state in the working telephone line. (clear ring, busy) Support judge the continuity of the cables or wires. Specification: Model: TM-8B Color: Yellow Battery: 2 * DC 9V battery (NOT included) Working Current: Tester: 20mA, Receiver: 150mA Signal Transfer Mode: Digital signal Signal Output Level: 8Vp-p Signal Transfer Distance: 3Km Size (Approx.): Transmitter: 135*65*30mm/5.3*2.5*1.1inch Receiver: 215*35*25mm/8.4*1.3*1inch Weight: Approx. 421g / 14.9oz Package List: 1 x Cable Emitter 1 x Cable Receiver 1 x RJ11 Cable 1 x RJ45 Cable 1 x Earphone 1 x Cable with Crocodile Clamp 1 x Black Bag .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Note:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1Line Tracing: Rapidly find the target wire from among plenty of network, telephone wires 2Line Detection: Automatic efficiently scan for the miss wiring, disorder cable, short circuit, broken circuit and other breakpoints 3It comes with an earphone support to enable service technician to work conveniently and comfortably in noisy environment 4Receiver the tone signal on the cables or wires. (telephone line) 5Identify the state in the working telephone line. (clear ring, busy)