This powerful hand warmer is your best bet if you're looking for a device to warm your hands as well as charge your phone. It features 2 heat settings reaching 131℉ and can run for up to 12hrs on the lowest setting. This warmer can serve as heat therapy for people with rheumatoid arthritis, Raynaud's, and menstruation. Moreover, the extra massage mode can effectively alleviate muscle stiffness and soreness caused by sedentary behaviors. It also works as a power bank for electronic devices thanks