Stylish and on trend this watch is very smart indeed. Immediately recognises different activities, like walking, running, swimming and sleeping. Syncs up to Health Mate app (free to download compatible with iOS 8.0+ and Android 4.3+) so you can; customise your daily activity objectives, visualise your day to day progress, get personalised coaching, track your food and calories and challenge your friends; Steps and running - records steps, distance, calories and session duration. Swimming ; records calories and session duration. Water-resistant 50m (5atm). Sleep - records light and deep sleep phases and interruptions. Up to 8 months battery life; Automatically background syncs with Bluetooth low energy. Includes - silicone/metal wrist strap, belt/key ring/pocket clip, cr2032 battery. Size H19.5, W3.6, D1.1cm. Batteries required 1 x button cell (included).