External Continuous Power dual battery sistem. Allows hot battery swap. Rental includes adapters to power Atomos recorders (Shogun, Assassin, Flame, Inferno), adapter for Sony Alpha System cameras (NP-FW50), Canon LP-E6 (5D Mark III, etc), Nikon EN-EL15 (D800, etc) and Panasonic GH4 cameras (DMW-BLF19). The system has also a flexible dual USB source that allows you to charge 2 USB devices (up to 3A) such as smart phones, tablets or music players. DC input that allows you to charge the provided batteries (2x NP-F570 and 2x NP-F750) up to 3x times faster than conventional chargers.