Appears to contain everything I may need. Luckily I havent had to use it yet, but when I do I will be very happy to have it. Its nice to be have everything in one place.
I could probably get a battery for less, but its worth a little more to have everything all at once and in the same place. I dont have to worry about changing my battery and not having an o ring available. I keep a spare kit in my dive bag all the time.
We purchased 3 Data Max Pro Plus 2 Gauge Gaurds, one for each of our computers and one for our Advance Dive Instructor, as a small gift. Very nice. Initially I thought it was a pain because of the air bubbles but one under water the bubbles disappear. It is a great way to preserve the integerity of the computer face.