Garmin Vivofit 2 review: An activity tracker with year-long battery life, no charger needed - CNET
Garmin vívofit® 4 | Fitness Activity Tracker
Amazon.com: Garmin vívofit 4 activity tracker with 1+ year battery life and color display. Small/Medium, Black. 010-01847-00, 0.61 inches : Sports & Outdoors