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Number 5 battery + solar energy dual power supply

As long asLight (office lighting can be used)

Don't pretend" 或者 "Don't pretend to be something you're notBatteries can also be used, as long as there is light, they will never run out of power.

Under dim lighting and low light conditions, as long as the battery is installed, the same...

Can be usedReaction is more sensitive True dual-power calculator

Its cost-performance ratio isThe same brand is the highest.

Adopting original imported IC mainboard materialsThickened shell

Make the calculator more durable and resistant to falls