Locate open circuit: Powered by 2pcsx9V batteries (notes: not included). It detects and alerts immediately where a circuit is open. You can quickly locate short circuits, open connections, and broken wires. Check short circuit: You can also find intermittent circuit problems by flexing wires or connectors and listening for a change in the receiver tone. Flexible probe: Flexible probe help reach wires in congested places and hard-to-reach areas. Multifunction: It is designed to identify and trace wires or cables without damaging the insulation. It also can be used in checking short circuits, locating open circuits, wire tracing, wire identification, and more. Quick and easy: Judge the continuity of the cables or wires, and diagnose the breaking point, making your repairs quick. Specification: Receiver: 240x44mm Transmitter: 58x68mm Color: Black Material: ABS Battery: 6F22 9V battery (not included) Package Includes: 1 x Automotive short and open finder transmitter 1 x Automotive short and open finder receiver 1 x User manual