The Fitbit Flex Activity Tracker in size Large and color Pink is a plastic device that provides detailed information about your sleep quality, activity levels, floors climbed, time spent, and distance traveled. It can be synced wirelessly to various operating systems such as Windows, iOS, macOS, and Android. The set includes a charging cable, wireless sync dongle, and a wristband tracker, making it convenient for use in gym workouts or running and jogging activities. With water-resistant features and the ability to sync with mobile and online tools, the Fitbit Flex offers a comprehensive fitness tracking experience.