1.Instantly Locate Open Circuits: Powered by 2 * 9V batteries (not included), this automotive wire open short finderquickly detects open circuits and emits a warning signal. It allows you to locate short circuits, open circuits, and broken wires with ease. 2. Short Circuit Check: You can also discover intermittent circuit problems by bending wires or connectors and listening for changes in the receiver's tone. The flexible probe of car circuit scanner helps reach crowded areas and hard-to-access wire locations. 3. Multifunctional: It can identify and trace wires or cables without damaging the insulation. This versatile car cable wire tracker tester is useful for checking short circuits, locating open circuits, wire tracing, wire identification, and more.