DY25 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 guework. This profeional tool will work on all kinds of circuits with voltages between 6 and 42 volt DC.such as those found in automobiles,trucks,tractors,boats,RVs,etc...With its wide working voltage range PACKING LIST: DY25 Sender 1 pcs DY25 Receiver 1 pcs User manual 1 pcs(in English) Oxford handbag 1 pcs Automotive Short Cable Tracker&Open Wire Finder Le Than 42V DC Find Car Short Circuit Wire 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. Specification 1.Wire Tracing 2.Checking for short circuit 3.locating open circuit 4.Wire identification Multi-function circuit tester Easily solve your circuit problems Identify and track lines , find and determine shorts and break points 3 . 5MM headphone jack increases the listening effect in noisy environment 248 MM long probe hose is more convenient to operate Function * Tracing of wires is made poible 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, acro 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! Flexible probe made of 248mm steel wire Highly sensitive probe The tester uses advanced sensors for high sensitivity and fast response Quickly find circuit problems with high precision Beep alarm When a circuit breakpoint is detected , the receiver emits a "beep"soundThe closer the probe is to the breakpoint , the faster the sound isand the higher the volume LAUNCHER With two modes can be choose to easily solve circuit problems Mode : TONE ( Cable Tracking / FindBreakpoint / Cable Identification ) Pull the transmitters open key to Cable Tracking /Find the location of the breakpointcable identication At this time the reLED of the transmitter is on . f the red LED is not lit , check the powerconnectio n ( Please refer to the manual for the detailed measurement method ) Mode : CONT ( Find short circuit) Pull the transmitters open key to the " find short positiorAt this point , the green LED of the transmitter is on . If the greenLED is not lit , check the power connection ( Please refer to the manual for detailed measurement methods) Sensitivity adjustable Sensitivity can be adjusted according to the detected environment External headset connection When used in a noisy environment , connecting headphones candetect circuit problems more quickly When performing cable breakpoint check , cabletracking and cable identification in a relatively noisyjudgment resuit a 3.5mm plug earphone can as " senvironment . in order to avoid the noise infiuenoIsed for monitoring and judgment (steps for usage) Before inserting the earphone , first adjust thesensitivity of the receiver to the minimum , and theninsert the earphone detection to gradually increasethe sensitivity until the earphone volume Is moderate 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 poible range the Receiver's probe tip (black cap) should be positioned perpendicular (at 90) to the wire being traced and either above or below it.