- water powered calculator
- 2017-01-13 22:19
- the water powered calculator not used the dry battery , which used our water powered battery which only add water can ru
- 8 digital plastic calculator
- 2017-01-13 22:19
- 1.It is powered by water,no pollution 2.CERohs approved 3.LCD display 4.Ato-power-off 5.At least 2 years lifetime