Auto Car Short Circuit Finder detects and alerts you immediately where a circuit is open. You can quickly and easily Locate short circuits,open connections, broken wires, current leaks and even trace wires. You can also find intermittent circuit problems by flexing wires or connectors and listening for a change in the receiver tone Allowing you general tracing or pinpointing the problem location. It also shows you the direction to the short with its direction indicator,eliminating the guesswork. This professional tool will work on all kinds of circuits with voltages less than 42 volt DC. such as those found in automobiles,trucks,,boats,RVs,etc...With its wide working voltage range, do not use at AC voltage or over 42V device 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, (.: 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 of vehicles with mixed or single 42 Volt systems Operates on DC voltages Max 42 volts Internally protected against power surges and overloads 9.76inch (24.8cm) flexible probe allows reaching wires in congested places Transmitter LEDs show open or short circuit conditions Adjustable sensitivity for all tracing situations This instrument is designed to identify and trace wires or cables without damaging the insulation. You can also use it in checking for short circuit and loacting open circuit and so on.There are a Sender and a Receiver included in the instrument. Wire Tracing Checking for short circuit locating open circuit Wire identification Colour:As Shown Material:plastic Package Contents: 1 x Automotive Short and Open Finder Transmitter and Receiver 1 x English Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.