The IndiPRO Tools 81PPC 24" 2.5mm to Canon LP-E6 Type Dummy Battery Cable is designed to work with optional select IndiPRO Tools POWER POD systems to provide power to devices that accept Canon LP-E6 type batteries. The cable is 24" long and polarity tested with the optional POWER POD systems, so you don't have to worry about crossed polarity when powering devices.