Features: Tracing of wires is made possible even inside-bundles, co-nduits, behind panels, under carpets, upholsterys, etc Easy to use: simply connect the transmitter in series with the circuit or wire under test, (i.e.: in place of a blown fuse, across-a connector, in series with an open wire, a light bulb socket, etc.), and scanning the circuit/wire with the tracers flexible probe to find the trouble spot 42V Readys: for use in the new generation of vehicles with mix or single 42Volt systems Operates on DC voltages from 6 to 42V Transmitter and Receiver LEDs show open or short circuit mix or single 42Volt systems conditions Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement HOW TO USE THE PROBE? The probe of the Receiver is built of coiled steel and may be bent as needed, in order to-reach wires in ongested or difficult areas. Depending on the circuit characteristic 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's probe tip (black cap) should be positioned perpendicular (at 90o) to the wire being traced and either above or below it. Package List: 1x Automotive Short and Open Finder 1 x Instruction Manual Package List: 1 Set Automotive Electric Circuit Tester