Specifications: Condition: Brand New Material: Plastic shell Receiver size: approx. 23*4*2.5cm Sender size: approx. 6.7*5.8*2.2cm Working voltage: 9V laminated cell (NOT included) Working temperature/humidity: -10C-+60C/20%-70% The instrument is designed to identify and trace wires or cables within a group without damaging the insulation. For telephone line, it can identify some state in the line, and more convenience to install, debug, maintain telephone line. There are a sender and a receiver included in the cable tracker. Application: Judge continuity of the cables or wires. Track the cables or wires, and diagnose the break point. Receive the tone signal on the cables or wires (telephone line) Identify the state in the working telephone line (clear, ring, busy) Send a single solid tone or dual alternating tone to the object cables or wires. Package Included: 1pc x Sender 1pc x Receiver 1pc x User manual 1pc x Tool bag Notes: Other accessories demo in the picture is not included. Due to manual measurement, please allow size differences about 1-5mm. Due to the light and screen setting difference, the item"'"s color may be slightly different.