<p>Locating Open Circuit: Automotive electrical open&amp;short finder circuit tester, powered by 2pcs*9V Batteries. It 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. Transmitter and receiver LEDs show open or short circuit conditions.</p> <p>Checking Short Circuit: em415pro Automotive electrical open&amp;short finder circuit tester, you can also find intermittent circuit problems by flexing wires or connectors and listening for a change in the receiver tone, 7 inch Flexible Probe Help Reaching Wires in Congested Places.</p> <p>Suitable For DC 6~42 Volt Circuit Power: Electrical wire tracer 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).</p> <p>Operation Video: Automotive Short Circuit Tester, Check Out Our VIDEO on the Left Side, Internally Protected Against Power Surges and Overloads. Built-in Buzzer Sound Show Open or Short Circuit Conditions, Comes with a storage bag, easy to carry.</p> <p>Quick And Easy Diagnostic: em415pro Automotive electrical, judge continuity of the cables or wires, and diagnose the break point. Time saver, making your repairs quicker, makes things easier to find troubles, Tried to find a fault in auto electric circuit.</p>