You're probably thinking, "Oh, the title is just a misprint, it's actually SOLAR powered." Except you'd be wrong. This is a water powered calculator and clock that has a reservoir to store up to 2 months worth of power. The great thing is that the set is sleek enough to sit on your desk at work, and cool enough to take into meetings. When someone asks for a quick calculation, just pass over your water calculator and watch their reaction as they hear the distinct swish of the reservoir.

Added from www.thinkgeek.com