Specially designed battery pack for heated clothes: Portable Charger compatible for USB 5V 2A heated vest and FERNIDA Heated pants. Power Bank output 5V 3A makes heating clothes hotter. It can be used as an extra heated clothes battery pack. And also suitable for charging smartphones. Lightweight & Portable: Easily slides into pockets, handbags, or bags. When used with FERNIDA USB heated clothes (High mode Continuous use time 3.5 hours; Medium mode 5.5 hours, Low mode 8 hours). And the portable charger can charge an iPhone up to 3.5 times or an iPad 2 times.