Home » Gadgets » USB Hand Warmer Gadgets USB Hand Warmer November 13, 2019 63 Double-sided heating and 2 temperature settings. Low:113-122?/45-50? and High: 131-140?/55-60?,fast heating up in 8 seconds.Made of high-tech aircraft-grade aluminum and ABS matrial, eco-friendly polymer battery.Explosion-proof,anti-scalding,shockproof,radiation-free,no fade and feel comfortable.
