XP-HD100-W:
The bracket is placed on the side of PRO-X XP-HD100S( A), allows to mount a Focus Firestore on it. It also can be a wireless receiver mount.

XP-HD100-F:
The bracket is placed on the side of PRO-X XP-HD100S(A), allows to mount a Focus Firestore on it. It also can be fit with a XP-HD100-W together to mount a wireless receiver at the same time.