DetailsThis 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