Track your sleep, activity, heart health, ovulation/menstrual cycle, and more. This ring has turned my health and life around for the better. Battery life is 5-6 days average. Charges very quickly. Comes with charger and cable. Works perfectly. Used for four months. Needed a larger size & too late to return. Has normal wear and tear and some rubbing off on the side from the ring I wore next to it. You do not notice this unless your ring is off or rotated & you look closely.