EM415PRO 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 voltage, such as those found in automobiles, trucks, tractors, boats, RVs, etc. With its wide working voltage range. Features: Quickly and easily locate short circuits. Judge continuty 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). Indentify the state in the working telephone line (clear, ring, busy). Send a solid tone or a dual alternating tone to the object cables or wires. Tracing of wires is made possible even inside bundles, conduits, behind panels, under carpets, upholstery, etc. Easy to use: simply connect the transmitter in series with the circuit or wire under test, and scanning the circuit/wire with the tracers flexible probe to find the trouble spot. Internally protected against power surges and overloads. 7in flexible probe allows reaching wires in congested places. Transmitter and receiver LEDs show open or short circuit conditions. Adjustable sensitivity for all tracing situations. No wire piercing required, non-contact technology. Specifications: Battery: 9V battery (not included) Materiale: coiled steel Package size: 250 * 120 * 50mm / 9.8 * 4.7 * 2.0in Package weight: 300g / 10.6ounce Packing List: 1 * Automotive Tester 1 * User Manual 1 * Storage Bag