The Face Mask Air Fan is the most Japanese thing you can think - period! It is related to face masks (which will continue being common in Japan even after the Covid pandemic, as they have been for a century already). It's a gimmicky gadget. It's practical. And it solves a problem that you probably thought unsolvable: how to make a face mask less hot and more breathable. And the answer? With a very small, very portable fan that clips onto the inside of the mask!
The Face Mask Air Fan works with pretty much all masks - paper, fabric, or polyurethane mix. It's so light (just 22 g/0.7 oz) that it won't affect the mask's fit. You charge it from any USB power outlet for 5 hours and it is then good for 3.5 hours, allowing your face to stay cool and keeping the bacteria or pollen particles away (it's a fan, remember). It comes with a 30 cm (11.8") USB cable and features two modes (regular and the slower "rhythm"), easily accessible by the push of a button. If you are wearing a mask, you definitely need this fan!
The Face Mask Air Fan features: