QR-HOTSWAP mounts directly to the camera for true perpetual, continuous battery operation. Unlike "stacking" batteries one behind the other, electronics in the QR-Hotswap allow for true "hot swapping" allowing ether battery to be changed atany time. The circuitry automatically combines the output of both Digital battery fuel gauges for accurate display in the cameras with InterActive viewfinder features. Used with two Dionic 90 batteries, the lightweight QR-Hotswap allows for 180 watt hours of capacity and seamless, truly perpetual, power. QR-Hotswap can be used with any combination of Anton/Bauer Dionic or HyTron 50 batteries ONLY. QR-Hotswap comes in three mounting options. QR Hotswap GM mounts directly to the Gold Mount. Dual 3 Stud Anton Bauer Power Tap Connection Mounts to rear of Equipment. Voltage: 12-14.4 VDC.