The 2.5mm DC Power Cable to Panasonic DMW-BLF19 Dummy Battery is a 24" cable that terminates in a regulated GH4 / GH3 type dummy battery. The other end of the cable has a 2.5mm barrel connector. The cable is polarity tested with the Indipro Power Systems, preventing the risk of crossed polarity when powering your camera. Made in the USA.