Step 1: Fill with water. Step 2: There is no step 2. These awesome clocks run entirely on water and don’t need to be changed for up to six months! With multiple styles to choose from, these clocks make an awesome geeky gift.

Powered entirely by tap water; no batteries!
Runs 5 weeks to 6 months before needing to change water
Drop style features calendar, alarm, 12/24 display, hourly chime
Round style keeps time in 12-hr format

Add water to the reservoir and the clock is immediately ready to be set. The large and vibrant LCD screen is easy to read from afar.