! This instrument is designed to identify and trace wires or cables without damaging the insulation. You can also use it to check short circuit and loacting open circuit and so on. There are a Sender and a Receiver included in the instrument. 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 6-42 V Ready: for use in the 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 7inch 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! Specification: Wire Tracing Checking for short circuit locating open circuit Wire identification Item Length:20.4 cm Item Width:4.4 cm Item Type:Electrical Testers & Test Leads Special Features:short cable finder. Power Supply:Two 9V batteries Required Item Type: Electrical Testers & Test Leads Item Weight: 0.22kg color:As shown Material:plastic Package Contents: 1 x Automotive Short and Open Finder (9 Volt Battery Not included) 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.