Vector Watch Luna Smartwatch -30 Day+ Autonomy, 5ATM, Notifications, Activity Tracking - Black Case/ Black Silicon-Sport Display: Memory LCD (Always On) 30 Day Battery Life Average Charging Time: 2.5 - 3 hours, Persolnalization: Customize w/ different watch faces. Compatible With: iOS, Android & Windows Smartphones Activity Tracking: Keep track of your activities inluding steps, distance, calories burned as well as the duration and quality of your sleep.