Features: Protective power-switch for low power consumption. High quality protecive cover provides more secure protect. Send single solid tone or dual alternating tone to the object cables or wires. Automatic efficient scan for miss wiring, disorder cable, open and short circuit. Judge continuity of the cables or wires, track the cables or wires, and diagnose the break-point, receiver the tone signal on the cables or wires(telephone line), identify the state in the working telephone line (clear-ring, busy). Specifications: Material: ABS Power Supply: 9V Battery(Battery Included) Signal Output Level: 8Vp-p Size: As Shown Package Includes: 1x Cable Transmitter 1x Cable Receiver/Tracker 1x RJ45 Cable 1x RJ11 Cable 1x Crocodile-Clamp Cable 1x Earphone 1x Instruction manual 2x 9V Battery 1x Pouch note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.