The IndiPRO Tools 24? 2.5mm to Sony A7 Type Dummy Battery Cable is designed to work with optional select IndiPRO Tools POWER POD systems to provide power to devices that accept Sony A7 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. This 24? long cable features a 2.5mm coaxial power connector to a Sony A7 dummy battery. Although you can use this cable to connect optional power solutions with a 2.5mm connector to power your device, the cable has only been polarity tested with the optional IndiPro Tools POWER POD Dual & Quad LP-E6 (7.2v) battery mounting plates.