Features: Internally protected against power surges and overloads. It comes with a storage bag, convenient to carry and store. With the flexible probe you can reach wires in congested places. Transmitter and receiver LEDs show open or short circuit conditions. Judge continuity of the cables or wires, and diagnose the break point. Function introduction: 1. Special electronic testing tools for automobiles 2. Short circuit/open circuit finder 1. The car test tool series are suitable for use as professional car maintenance and inspection tools, DIY tools for your car, and standing tools with the car. 2. This instrument can check the cable break point, find the short-circuit cable, identify and trace the wire without damaging the insulation layer. This instrument includes a transmitter and a receiver. 3. The curved receiving probe can better detect cables in crowded and narrow environments. According to the characteristics of the circuit and the sensitivity setting, the probe can pick up the signal of the cable within a certain range. When detecting, put the detector head of the receiver on the vertical (90°) position above or below the cable. Instructions for use: 1. Can only be used for DC voltage, can not connect DC voltage greater than 42 volts under any environment. 2. Cannot be used for AC voltage. 3. Cannot be used for circuits that are directly or indirectly connected to an AC cable or any AC power source. 4. Cannot be used with any ignition circuit and components. 5 . Before using this instrument to inspect automotive cables, disconnect any components or subsystems that are sensitive to voltage or current pulses, such as air pocket , electronic control modules, etc. 6. Disconnect any part or subsystem of the vehicle in accordance with the relevant rules for car maintenance and the requirements of the car maintenance manual. Specifications: Condition:100% Brand New Material: ABS Color: As shown in the picture Size: As shown in the picture Battery: 9V battery(Not included) Package List: 1*Automotive Short and Open Finder Sender 1*Automotive Short and Open Finder Receiver 1* Carrying Pouch 1*Instruction Manual .