This is the Canon battery grip is for the 5D Mark IV camera. It will not attach to any other camera.
The grip doubles the battery capacity of the camera by enabling two LP-E6 batteries to be used at the same time. It also improves the ergonomics of the camera when shooting in the vertical (portrait) orientation.
Requires 2 LP-E6 batteries, not included with the rental of the grip.
However, 1 LP-E6 battery is packaged with the rental of 5D Mark III camera so only 1 additional battery is required to use the grip.
Accessories supplied with the grip: