The instrument is designed do identify and track wires or cables without damaging the insulation. You can also use it do check for shorts and locate open circuits. The instrument includes the sender and the receiver. Characteristics: 1,42 V is suitable do new generation vehicles with hybrid or single 42-volt systems. 2. Operate under DC voltage from 6 V do 42 V. The flexible 3,7" probe allows threading in crowded places. 4. LED transmitter and receiver display circuit break or short-circuit state 5. Sensitivity can be adjusted we of all tracking situations 6. No ma punching needs, touchless technology! Please note the following messages. Some contents of the package may not contain batteries do limitation of some logistics Function Check short circuit, open circuit location, wire identification, wire tracking, etc. Functions It is possible to track wires that are even inside bundles, wires, za panels, under carpets, upholstery, etc. The flexible probe allows you to reach do wires in crowded places. No wire required piercing, touchless technology. Internally protects against voltage spikes and overloads. User manual Short-circuit checking: Turn off the power during testing; Set the transmitter switch to "CONT", connect the do the wires to be checked. If the resistance < 10k ohm, the LED "CONT" diode will be green. This means that the wires are short-circuited. Package: 1 x Automotive Short and Open Finder (in a portable bag) 1 x User Manual Does not include batteries