This USB fan has an 18650 battery inside that can provide 4+ hours on the low setting and over an hour and a half on high setting.
UPDATE: After I posted this video, Ace doubled the price of the Handyfan to P399.
The fan includes a micro USB charge cable which you can plug into your existing phone charger or even your computer. The fan can run from a USB power supply even with the battery removed.
At the highest setting, the fan consumes just 2.5 watts.
Interestingly the front plastic grill really makes a big difference to the fan. Removing the grill results in a much softer feeling stream of air.
The type of battery used inside this rechargeable fan is the 18650 which is commonly used in powerbanks and torches.
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