Fangrui Product Details Description: 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, (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! Specification Wire Tracing Checking For Short Circuit Locating Open Circuit Wire Identification Specifications: Item Width:4.4 Cm Material Type:coiled Steel Item Type:electrical Testers & Test Leads Item Length:20.4 Cm Item Weight:370 G Special Features:short Cable Finder Package Included: 1 Instant Car Circuit Scanner (9 Volt Battery Not Included) 1 Instruction Manual Notes: This Package Does Not Include Batteries