The Housing fits a lot of different cameras, only a different tray for the camera is needed. So it is future proof if you consider upgrading later on. The housing is at the moment configured for a Sony a7r2, a7s2, a7r3, a7r4, a9.
https://www.easydive.it/en/underwater-housing/mirrorless/leo3-wi.224.html
The standard Buttons are:
on the front:
Autofocus and shutter
on the back:
Movie Record
Aperture up and down
Shutter Speed up and down
ISO up and down
switch button (to get access to an additional button layout)
off Button
The depth rating of that setup ist 150 (!) meters.
The set includes:
Housing (Price New: 2590€) (including 1 battery and a charger and 1x Nikonos 5 connector)
1 X ADDITIONAL NIKONOS BULKHEAD (159 euro)
1x VACUUM SISTEM (249 euro)
additional manual Optical Trigger (159€)
2x Ballheads attached to the housing (52€)
avaiable also:
ports, seacam ports adapter ring
price 2500 euro with sony a7r3/4 plate