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How can I check the battery level for my wireless mouse?
To check the battery power level, switch to 
or 
mode from the bottom of the mouse. Alternatively, charge the mouse. The power LED indicators on the mouse will light up and show the battery power level.
The power LED indicators do not light up during mouse operation until the battery power is very low.
EC-CW series/U2:
It takes about 2 hours to fully charge the mouse.
A fully charged mouse can work up to 70 hours wirelessly with constant movement.
FK2-DW/ZA13-DW/S2-DW/U2-DW:
To check the battery power level, switch to wireless mode from the bottom of the mouse. Alternatively, charge the mouse. The power LED indicators on the mouse will light up and show the battery power level.
It takes about 2 hours to fully charge the mouse.
A fully charged mouse can work up to 80 hours wirelessly with constant movement.
Battery Life: 80hrs(1Khz) / 30hrs(2Khz) / 24hrs(4Khz)
The power LED indicators light up for around 10 seconds when you power on the mouse.
When the last LED indicator flashes, that means the power is less than 10%. Please charge using the enhanced wireless receiver or included USB-C cable.