Feature: 1. Used to detect and alert 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. 2. 7in flexible probe can be bent as needed to facilitate reaching wires in ongested or difficult places. According to the characteristics of the circuit and the sensitivity setting, the probe will pick up the signal from the wire within a certain range. 3. In order to obtain the best range, the probe tip (black cap) of the receiver should be perpendicular (at 90°)to the wire being traced and either above or below it. 4. Suitable for use in the new generation of vehicles with mixed or single 42 Volt systems, and can operate at a DC voltage of 6 to 42 volts. 5. With internal protection, protect it from power surges and overloads. Transmitter and receiver LEDs display open circuit or short circuit status. 6. Adjustable sensitivity, suitable for all tracking situations. No wire piercing required, non‑contact technology, easy to use. Specification: Item Type: Short and Open Circuit Finder Material: Plastic + Metal Battery: 6F22 9V Battery (not include) Specification: 1. Wire Tracing 2. Checking for short circuit 3. Locating open circuit 4. Wire identification Description: 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 guesswork. This professional 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 Function: Quickly and easily locate short circuits Save your times and increase your income Judge continuity of the cables or wires. Track the cables or wires, and diagnose the break point Receive the tone signal on the cables or wires(telephone line) Identify the state in the working telephone line (clear, ring, busy) Send a single solid tone or a dual alternating tone to the object cables or wires. How to Use: Simply connect the transmitter in series with the circuit or wire under test, (i.e.: in place of a blown fuse, across 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 wire of the circuit to use. . Package List: 2 x Short and Open Circuit Finder1 x Manual1 x Earphone1 x Tool Bag