In addition to standard health and fitness tracking, the Versa 2 Health & Fitness Smartwatch from Fitbit features a built-in microphone for delivering voice commands to the Amazon Alexa digital assistant. Have Alexa answer questions, get the weather for your next workout, set alarms, reminders, and more. The Versa 2 also streams music, either from the 300+ songs you can store in the watch, or via your Spotify, Pandora, or Deezer apps. 1 Year Warranty. Sleep tracking & sleep score: See the quality of each night's sleep by measuring heart rate, time asleep, time awake, time in deep and REM sleep and restlessness. Sensor Type: Optical Heart Rate Sensor, Accelerometer, Altimeter, Ambient Light Sensor. Always-on display mode: See real-time exercise stats and check the time with just a glance - even when your hands are full. Turn the mode off to be more discreet. Safety Data Sheet . Dimensions: 1. 5" L x 1. 5" W x 0. 45" W. Heart rate tracking: Use 24/7 heart rate tracking to better track calorie burn, optimize effort during workouts, see your resting heart rate trends and cardio fitness level. Get your notifications: Get notifications for calls, texts, calendar events and apps - plus send quick replies and voice replies right from your wrist.