The idea is to make a wish on November 11,2011 at 11 am.
I didn't receive it time for wish making, but it's a fun novelty and it does serve as a watch for the rest of the year.
I don't see a compartment for a replacement battery.
The time was easy to set up.
The watch itself is removable from the rubber watch band. The band fits me fine, but I imagine can be quite snug. Although it stretches,it doesn't really stretch too far and is not a "one size fits all".
Most likely it's best worn and appreciated by a young girl.