The XP-HD100s connects to the battery compartment of the JVC GY-HD100/110u cameras and mounts with 2 screws. The adapter plate offers a regulated 7.4v to power the camera as well as a 12v P-Tap to power an additional 12v accessory like an on-camera light. The plate also has the necessary mountings to work with the S-GJS-T wireless mic plate receiver.