We have been using hydle power for many years now, but putting it to good use is the high-tech designed: Water Powered Calculator. When you need to add 2 with 2you may not need the calculator (unless you are on the comp!), but for big numbers you generally would try one of those solar powered thingies. Try the Water Powered Calculator as it runs only on water and requires no batteries, wires, or plugs. There is separate cartridge that holds water, which you can refill. Each refill lasts for about three it’s a simple basic calculator that features soft rubber keys and a large LCD screen. The calculator's water powered battery is good for 2 years. So anyone who needs a new calculator plus wants to do their bit for the environment can get this piece and feel good!

The Water Powered Calculator costs $14.95.