FUNCTION: Wire tracing is made possible even inside bundles, conduits, behind panels, under carpets, upholstery, etc. Easy to use: simply connect the transmitter in series with the circuit or wire under test (ie: in place of a blown fuse, through a connector, in series with a wire open, a light bulb socket, etc.) and scan the circuit/wire with the flexible probe tracers to find the problem spot 42V Ready: For use in the next generation of vehicles with systems 42 Volt mixed or single Operates on DC voltages from 6 to 42 volts Internal overvoltage and overload protection The flexible 7" probe helps reach wires in congested areas LEDs on transmitter and receiver indicate open or short circuit conditions Adjustable sensitivity for any s tracing situations No wire drilling required, non-contact technology! HOW TO USE THE PROBE? The receiver probe is constructed of wound steel and can be bent as needed, in order to reach wires in congested or difficult areas. Depending on circuit characteristics and sensitivity settings, the probe will pick up the signal from the wire in a range of positions. However, for the best possible range, the receiver probe tip (black cap) should be positioned perpendicular (90o) to the traced wire and either above or below it. Package List: 1 x Automotive Short and Open Finder (with battery) 1 x Instruction Manual.