Garmin vivofit 3, activity tracker with 1+ year battery life, sleep monitoring and automatic activity detection, black

AUTOMATIC ACTIVITY DETECTION Capture different activities automatically and view them on Garmin Connect online 1 YEAR BATTERY LIFE No need to recharge. Regular: 135-205 millimeters in circumference X Large: 165-225 millimeters in circumference 24/7 WEAR The sleek silicone band is comfortable for all-day wear on land or in the water. Battery: One replaceable CR1632 coin cell. Smartphone compatibility: iPhone, Android GCM COMPATIBLE Sync automatically or manually with our free smartphone app to view and analyze your stats Screen size 10 millimeters x 10 millimeters. Screen type viewable in sunlight, transflective memory in pixels (MIP). Screen resolution: 64 x 64 pixels