– a smart watch for tracking all-day activities. It comes with innovative features: voice reply to messages (Android only), Spotify, in-app sleep quality score, secure payment with #FitbitPay, plus an always-on display. 24/7 heart rate monitoring, storage and playback of 300+ songs. Download hundreds of apps for fitness, finance, sports and entertainment. Get notifications for calls, messages, calendar, events and apps. Battery life 5+ days, waterproof up to 50m.