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It does not require batteries and operates only in direct sunlight
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All LEDs will turn off
H2O Power Water Calculator 12 Digits Ecological solar toys It does not require batteriesCalculate conveniently and in harmony with nature! The H2O desktop calculator is a revolutionary device that requires only clean water to work! Forget about purchasing and disposing of batteries or lighting restrictions for solar calculators. Designed by Tango Group, this 12 digit calculator uses patented H2O water activated battery technology. This is a breakthrough, ecological solution for an everyday product at home and in the office, offering
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