Main Function: 1.Wire Tracing 2.Checking for short circuit 3.locating open circuit 4.Wire identification Function * Tracing of wires 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, (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 * 42 V Ready: for use in the new generation of vehicles with mixed or single 42 Volt systems * Operates on DC voltages from 6 to 42 volts * Internally protected against power surges and overloads * 7" flexible probe allows reaching wires in congested places * Transmitter and Receiver LEDs show open or short circuit conditions * Adjustable sensitivity for all tracing situations * No wire piercing required, non-contact technology! PACKING LIST: DY25 Sender 1 pcs DY25 Receiver 1 pcs User manual 1 pcs（in English） Oxford handbag 1 pcs