This underwater casing has been used just the once I used the WP-DC800 with my canon ixus 400 ( for sale in my other auction ) and it got stunning results even though I was only snorkeling but you can go down to 40M with it.
Sorry i dont have the original box or paperwork but you only have to place your camera in it and close it up and your ready to shoot images underwater.
Any questions please just ask.