Worn once, like new. Operating System: android Memory Storage Capacity: 6400 MB Special Feature: GPS Connectivity Technology: Bluetooth Wireless Communication: Standard Bluetooth Battery Cell Composition: Lithium Ion See how jewelry gets smart with a tracker that doubles as a timeless accessory and features a vibrant color display Get better sleep to power your days with sleep tracking and sleep Score in the Fitbit app Feel a Buzz when you reach your target heart rate zones, while you earn active zone minutes 6-month trial of Fitbit Premium(New and returning Premium members only. Must activate trial within 60-days of device activation. Requires valid payment method.Content and features may change. Terms & Conditions apply) Maximize your exercise, understand resting heart rate trends and better estimate calorie burn with 24/7 heart rate tracking Tune in to your body with health metrics like breathing rate, heart rate variability and more (in-app only) Enjoy up to 5 days of battery without having to stop for a charge (varies with use and other factors) Connect Luxe to your phone’s GPS & see real-time pace and distance on your wrist