Fitness tracker with continuous heart rate. Polar A370 is a sleek and sporty waterproof fitness tracker that helps you stay on the pulse 24/7 with continuous heart rate monitoring, advanced sleep tracking and Polar’s unique workout features. Color TFT display with capacitive touchscreen, Screen resolution 80x160 pixels (RGB), Screen size 13mmx27mm, Polar proprietary optical heart rate module (2 green LEDs, 1 photodiode, analog front-end), Rechargeable 110 mAh battery, Battery life up to 4 days with 24/7 activity tracking, including 1 hour of training per day (without smart notifications in use) with continuous HR. Connectivity: Easy wireless sync via Bluetooth Smart with the Polar Flow app, Micro USB connector for charging and data sync with PC or Mac via Polar FlowSync. Compatible with: Computer running Mac OS X10.6 or later and Windows XP, 7, 8, 10, Mobile phones running iOS10 or later and Android 4.4 or later, Polar Balance smart scale, Polar H10 heart rate sensor, Apple Health Kit, Google Fit, MyFitnessPal and MapMyFitness. Updatable software - Languages: English, German, French, Spanish, Italian, Portuguese, Finnish, Swedish, Norwegian, Danish, Dutch, Japanese, Chinese (Simplified), Polish, Russian, Turkish, Czech, Indonesian. Weight: 31.7g, Wristband thickness: 13.5 mm, Wristband width: 23.5 mm, Wristband material: Silicone, Wristband size: S. Colour: Ruby Red.