Precise Open Circuit DetectionThis battery-powered device (batteries not included) instantly alerts you to the location of open circuits, allowing for quick and easy identification of short circuits, open connections, broken wires, and current leaks. Both transmitter and receiver feature LED indicators for open or short circuit conditions Short Circuit DiagnosisIdentify intermittent circuit issues by bending wires or connectors and listening for changes in the receiver's tone. The 7-inch flexible probe facilitates access to wires in cramped spaces Wide Voltage CompatibilitySuitable for all types of circuits with voltages between 6 and 42 volts DC, making it versatile for use in automobiles, trucks, tractors, boats, RVs, and more Efficient TroubleshootingQuickly determine cable or wire continuity and diagnose breakpoints, saving time and simplifying repairs by easily locating faults in automotive electrical circuits Versatile ApplicationIdeal for mechanics, electricians, and DIY enthusiasts working on various vehicles and electrical systems, streamlining the process of electrical fault detection and repair Specifications: Power supply: 9V battery powered (not included) Material: Plastic Operating voltage: 6-42V Note: For use with DC voltage only, do not connect to a circuit exceeding 42V DC under any circumstances. Do not use with AC voltage. Do not use on any circuit connected directly or indirectly to the AC line or any other AC power source. Do not use with any component or circuit of the ignition system. Before using this equipment, check the vehicle's wiring and disconnect any parts or systems that are sensitive to voltage and current pulses, such as air bags, electronic control modules, etc. After inspecting the vehicle, make sure that all disconnected connections have been properly restored. Always follow the instructions and procedures indicated in the vehicle's service manual before attempting to disconnect any part of the circuit subsystem.