SmallRig 2921 power cable is designed for external power supply for cameras and other equipment that uses a Sony NP-FW50 battery as the primary power source. One end is a dummy battery inserted into the camera’s battery compartment. The other end has a DC5521 7.4V connector for connection to a power adapter. The cable is compatible with the SmallRig EB2504 12V/7.4V adapter, which uses Sony NP-F batteries as the power source. Cable length: 60 cm.