Battery life :6 + days battery life and fast charging function. Compatible: Compatible with iOS 12.2 & Android OS 7.0. Integrated GPS: If you exercise while training outdoors, the built-in GPS shows the speed and distance of your smartwatch. In Fitbit App k, you are welcome to view your track and heart rate area. Continuous heart rate measurement: Continuous heart rate measurement can accurately record your calorie consumption and help you optimize your training to help you better understand your and fitness goals. Music player and storage: On the Versa 3k, you can store and play music and podcasts, control connected Ger Spotify playback, and load Deezer Playlists. The music streaming service requires a subscription and is not available in all L's. Activate Differentiation: This feature shows you your current heart rate zones to ensure they are effective at training targets. Built-in voice assistant: With Amazon Alexa, you can tell the weather, set reminders, control your smart home Ger and more via voice commands on the Versa 3.