built in to get quick news and information, check the weather, set timers and alarms, control your smart home devices and more all through the sound of your voiceBased on your heart rate, time asleep and restlessness, sleep score helps you better understand your sleep quality each night. Also track your time in light, deep and REM sleep stages and get personal insightsControl your appWith a larger display and an always on option, your informations always a quick glance away (always on display requires more frequent charging)Track heart rate 24x7, steps, distance, calories burned, hourly activity, active minutes and floors climbedWorks around the clock with 6 plus day battery life (varies with use and other factors)Get call, text, calendar and smartphone app notifications when your phone is nearby. Plus send quick replies and a voice replies on android onlyOperating temperature: 10 to 60 Celsius. Maximum operating altitude is 8,535 m