This 2.5mm DC to L-Series Dummy Battery Cable from IndiPRO Tools is a 24", 7.4V regulated cable that lets you power various cameras and devices that use an L-series battery. It's compatible with power sources with a 2.5mm barrel connector and up to 19V, 5A output, which gets regulated down to 7.4V. The cable is polarity-tested to prevent the risk of crossed polarity when powering your camera.