DSLR 15mm Rod Rail NP-F970 OR NP-F550 NP Battery Pinth HDMI Power Supply 5D2 5D3 It has 3 voltage outputs: 5V, 7.2V(for DSLR), 12V Use camera BP battery to supply power for camera, Monitor and so on With the Np-F970 Battery Pinth,you can use two Sony NP-F970 (or F550) batteries,to provide Power supply for your DSLR, HDMI Splitter & field Moniter Using the latest switching regulator modules,regulator efficiency,low heat,low power Screw material: alumimium alloy,Steel. thumb screw, thumb direction can be adjustable.