Features Voice commands / smartphone notifications Contactless payments via Fitbit Pay Health / fitness / skin temperature tracking with heart rate monitor & GPS Battery life: 6+ days Compatible with iOS / Android Fitbit Sense is the advanced health smartwatch that helps you tune in to your body with tools for stress management, heart health, Sp O2, skin temperature & more. Includes a 6-month free Premium trial for new Premium users. Reflection Easily log your mood, from very stressed to very calm, on Sense after an EDA Scan session or in the Fitbit app to help you reflect on what makes you feel your best. 24/7 heart rate tracking with Pure Pulse 2. 0 With a multipath sensor, Sense delivers Pure Pulse 2. 0 - Fitbit s 24/7 continuous heart rate tracking for exercise, sleep tracking and everything in between. High/low heart rate notifications Heart rate is a key indicator of health. Stay informed when Sense detects that yours is above or below your threshold. On-wrist skin temperature sensor Sense tracks your skin temperature each night to show how it varies from your personal baseline, so you can be aware of your trends over time. Sleep mode Snooze uninterrupted by using sleep mode to mute smartphone notifications and stop your screen from turning on at night. Set a schedule to turn sleep mode on automatically. Do not disturb mode Use do not disturb mode when you want to mute call, text, calendar and app notifications during the day. Smart Wake Set your Fitbit alarm to wake you with a quiet vibration during a lighter sleep stage to help you feel more refreshed.