Wrist-Based Heart Rate. Latest in GPS and accelerometer technology to track distance speed and pace. Smart Coaching delivers tools to achieve goals. Polar Flow app – track activity and analyze progress. Link Polar Flow account to third party services. Offers multiple GPS recording options. Timing features. Sleep analysis. Receive smart notifications via Bluetooth. Waterproof design (suitable for swimming). 8MB Flash memory. Sync via USB cable. Rechargeable 240mAh lith-poly battery. Case thickness: 12mm. Display size: 128 x 128px.