SOONWELL 2 Ports NP-F970 or F550 Battery Pinch E8 DC Coupler Battery Power Supply Adapter Plate for Camera E8 DC coupler with connecting cable for camera power supply Suitable for NP-F970 or NP-F550 batteries Application: monitors, cameras like EOS 550D 600D 650D 700D etc 15mm rod clamp with M4 thumb screw to mount the battery pinch on DSLR rig support system Engaged latest switching regulator modules circuit to make sure the power supply system is with low heat & low power consumption features