This Reel-Power fitting provides a method of connecting Reel-Power batteries to the Arri Alexa camera including the LF. The adaptor is fixed to the camera via the screws provided and electrical connection to the camera is made directly; without the need for additional cables or connections.

The RP-SF1 has the added benefit of one Power-Con (or D-Tap) connectors and one 3-Pin Fischer connector built-in, as well as one Lemo 2-Pin for accessories - enabling the user to power various accessories at the same time.
The Power-Con and Lemo connections are 12v regulated due to the higher voltage of the batteries.

This plate will allow one or two batteries in order to power the camera, you can also hot-swap and make a battery change if needed to supply continuous run-time to the camera.