【OPEN CIRCUIT LOCATION】Powered by 2 * 9V batteries. It detects and alerts you immediately when a circuit is open. You can quickly and easily locate shorts, open connections, broken wires, current leaks, and even trace wires. Transmitter and receiver LEDs indicate open or short circuit conditions. 【CHECK FOR SHORT CIRCUIT You can also find intermittent circuit problems by bending wires or connectors and listening for a change in receiver tone, the 7 inch flexible probe helps reach wires in congested places. 【SUITABLE FOR DC 6~42 Volt CIRCUIT POWER】It will work on all kinds of circuits with voltages between 6 and 42 volts DC. (such as those found in automobiles, trucks, tractors, boats, recreational vehicles, etc... With its wide operating voltage range.). 【OPERATION VIDEO】 Check out our video on the left side, internally protected against overvoltage and overload. Built-in Buzzer Sound Show under open circuit or short circuit condition, comes with a storage bag, easy to carry. 【QUICK AND EASY DIAGNOSIS】Judge the continuity of cables or wires and diagnose the breakpoint. Saves time, making your repairs faster, makes it easier to find problems. I tried to find a fault in the auto electrical circuit. Product Description INTRODUCTION This automotive wire tracer and shorts finder tool -circuits is designed to identify and trace wires or cables without damaging insulation. You can also use it to check for shorts, locate open circuits, wire tracing, wire identification, and more. There is a transmitter and a receiver included in the instrument. HOW TO USE THE PROBE? The receiver probe is constructed from coiled steel and can be bent as needed, so reach wires in congested or difficult areas. Depending on circuit characteristics and sensitivity settings, the probe will pick up the signal from the wire in a range of positions. However, for the best possible range, the receiver probe tip (black cap) should be positioned perpendicular to the wire to be traced and either above or below it. SPECIFICATIONS:</ p>Receiver: On/Off button Test button Probe length: 7 inch flexible probe Sender: Tone/Off/Cont (Continuity) switch Tone/Cont (Continuity ) LEDs Red and black test leads cable (61cm length, approximate) Receiver Dimensions: 38.5 x 4 x 2.3cm (H x W x D, approximate) Sender Dimensions: 6.5 x 5.6 x 2.1cm (H x W x D, approximate) DC Voltage: Operates from 6 to 42 volts Power: 2x9V battery (6F22) Please Note: This product set needs two batteries. Please install 9V 6F22 battery in both Receiver &amp; Transmitter. CAUTION 1. Only for use on DC voltage , don't connect to circuit exceeding 42 volts DC under any circumstances. 2. Do not use AC voltage. 3. Do not use on any circuit directly or indirectly connected to AC lines or any other AC power source. 4. Do not use with any component or circuits of the ignition system. 5. Before using this device, check the vehicle's electrical wiring and disconnect any part or system sensitive to voltage and current pulses such as air bags, electronic control modules, etc 6. After you finish checking vehicle, make sure you have correctly restored all the connections which you disconnected. 7. Always follow the instructions and procedures indicated in the vehicle's service manual before attempting to disconnect any part or subsystem of the electrical circuit. INCLUDING: Inner-Carrying Case,Outer-Carton 1 x Automotive Short and Open Finder Sender 1 x Automotive Short and Open Finder Receiver Carrying bag