Model Number: 7411 Key Specifications/Special Features: Auto circuit tracer is an easy-to-carry and operate equipment for car maintenanceThe main function for the equipment is to searching and diagnosing the short/open circuit of vehicle's circuit connection, another function is to identify the wire connection from whole vehicle's circuit connectionSuitable for all DC circuits up to 42VChecking for short-circuitLocating open circuitWith illumination mode9V battery x2 required