Check out this very cool glowing demon Slayer hyottoko mask. With clip on battery pack, stretchy adjustable headband, and four different light modes. Seen in training, final selection, and swordsmith village.
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Link to Mask:
taplink.cc/techoverflow/p/dem...
Music by @aykid5798
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This is a very nice product, but it's better for displaying than actually wearing as it is not super comfortable and can be a little difficult to see out of it. It also has a slight buzzing noise whenever it's turned on. Overall, it still a very cool product!