A stainless steel analogue watch that automatically tracks all your activity (steps, runs, swims, distance & calories burned), analyses your sleep, and lets you visualize all progress on your smartphone. Up to 8 months battery life. iOS & Android compatible. Activity tracking: automatically tracks all activity, including walks and runs and syncs all data to your smartphone via Bluetooth. Visualize your progress on your smartphone. Swim tracking : automatically detects swimming, so you can track and analyze your water workouts in the health mate app. It is water resistant up to 5 atm (50 meters - 165 feet). Sleep tracking : automatically detects sleep, and recognizes sleep patterns including light and deep sleep cycles, sleep interruptions, and the total duration of sleep. Set a silent alarm in the app to start your day with a gentle wake-up vibration. No charging needed : up to 8 months battery life. Coaching on your phone : steel syncs automatically with your phone so that you can track all progress and view graphs in the free health mate app. Wrist monitor. Size H19.5, W3.6, D1.1cm. Weight 0.03kg. Batteries required 1 x button cell (included). Manufacturers 2 Year (1 year fabric) guarantee.