This Cable Tracker is designed to identify and trace wires or cables within a group without damaging the insulation. For line, it can identify some states in . With this instrument install, debug, and maintain line is more convenient. A Sender and Receiver is included in the Cable Tracker. Color: yellow Material: ABS+ metal Application: Testing polarity of phone lines Tracing a wire Finding wires buried behind drywall Test whether a cable is interrupted Find interrupts in cable with all common tracing tone sources continuity of the cables or wires Track the cables or wires, and diagnose the break . Receive the tone signal on the cables or wires ( line) Identify the state in the working line (clear, ring, busy) Send a single solid tone or dual alternating tone to the object cables or wires Receiver: On/Off button Test button 3.5 mm earphone Sender: Tone/Off/Cont (Continuity) switch Tone/Cont (Continuity) LEDs Red and black test leads cable (61cm length, approximate) -in RJ-11 cable (47cm length, approximate) Receiver Dimensions: 23 x 4 x 2.3cm (H x W x D, approximate) Sender Dimensions: 6.5 x 5.6 x 2.1cm (H x W x D, approximate) : 9V battery (6F22) Not included Package Contents: 1 x Cable Tracker Sender 1 x Cable Tracker Receiver 1 x Carrying Pouch 1 x English User Manual Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.