Water Powered Calculator:
This is another type of calculator that runs on water. It has 3 water capsules to run the device. This calculator is a looks like a toy but it is a real, functional calculator. Its green color gives it a cool impression. For 2 to 3 months it can run on a single feeding of water capsules. After that you just have to refill water in those detachable capsules.
Wanna buy??
Click: www.perpetualkid.com/
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