Constant Power Source. The Panasonic AC Adapter for S5 includes the Panasonic DMW-DCC17 DC Coupler and the DMW-AC10 AC Adapter, and both of these components are required for it to work. It lets you use a wall outlet for constant power and uninterrupted shooting when the GH5 II or DC-S5’s USB Type-C port is in use. It’s great for time-lapse photography, locked-down event videography, studio use, etc.