Avia STRIDE Bluetooth OLED Display Enabled App-Based Activity Tracker Track your steps, distance, sleep, and total calories burned every day. STRIDE allows you to track workout sessions from start to finish while the real time OLED screen shows current progress throughout the day. Bluetooth 4.0 allows your stats to automatically stay in sync with your Apple iPhone or Android using Bluetooth 4.0. The Integrated USB tip removes easily to charge device. Includes 2 comfortable wrist bands - adjusts to fit all sizes Rated 5 Stars on the App Store, the Avia Ascend is recognized by industry leaders as the "most exciting fitness app in years" Time and Date display. Receive Push Notifications - Text message and Call Alerts.