The Panasonic DMW-DCC18 DC Coupler for DC-GH7 replaces the internal battery and powers the camera using AC power for longer, uninterrupted shooting sessions, specifically when the camera’s USB-C port is being used. The separately available DMW-ACC11 AC Power Adapter Cable is required for use with this DC coupler. The power adapter is required when recording to a USB SSD, and this coupler is required when the USB port is occupied.