So, as shown in the listing, the battery can detach at the back and essentially become a standalone 10,000mAh power pack. Of course, you cannot charge the phone with its fast charging speed since its maximum power is 10W. However, for my use I don't need the power bank feature at all. I've just been without power for almost a week due to Hurricane Ida and I don't think I could have made it without the one small fan I had. Damn it's so bad in the deep south when everything works as usual! So for me, this suction cup stays fully charged through EVERY power outage. But for those wondering if you remove the battery from the back there's another USB-C input so it can still be powered from a wall power bank or car charger, giving you the 10,000mAh -Can use power bank alone. . Still pretty cool! In terms of fan speeds, it's actually more like three speeds. Because first course is weird. It lasts a few seconds and then stops. It lasts a few seconds and then stops. Something like a slow pulse. It then runs at that speed all the time and then gets stronger at two more speeds. All in all, this is without a doubt the most amazing rechargeable fan I have ever seen!
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