Fitbit Sense

About this item

  • Optimize your workouts with a Daily Readiness Score that reveals if you’re ready to exercise or should focus on recovery (requires Fitbit Premium membership. Premium content recommendations are not available in all locales and may be in English only)
  • EDA Scan app detects electrodermal activity which may indicate your body’s response to stress and a built-in skin temperature sensor logs yours each night so you can see when it varies
  • With a compatible ECG app right on your wrist, assess your heart for atrial fibrillation–a heart rhythm irregularity–and share the results with your doctor (Only available in select countries. Not intended for use by people under 22 years old)
  • An on-wrist skin temperature sensor tracks yours each night so you can see how it varies
  • Personalized health & fitness guidance with a 6-month trial of Fitbit Premium for new Premium users (New & returning Premium users only. Valid payment method required. Content and features may change)
  • High & low heart rate notifications alert you if yours seems above or below your average
  • Battery lasts 6+ days—plus, fast charging gives you a full day’s charge in just 12 minutes (Varies with use and other factors; up to 12 hours with continuous GPS)
  • Use built-in GPS during runs, hikes, rides, and more to see pace & distance without your phone
  • Use your voice with Amazon Alexa Built-in to check the weather, set reminders, control smart home appliances, and more from your watch (Voice assistant availability and features may vary)
Brand Fitbit
Color Sage Grey/Silver
Special Feature Time Display, Sleep Monitor, Notifications, Heart Rate Monitor
Compatible Devices Smartphone
Age Range (Description) Adult
Style Modern
Connectivity Technology GPS
Shape Square
Band Material Type Silicone
Supported Application Sleep Monitor, Heart Rate Monitor


From the manufacturer

Sense watch
Fitbit Sense smartwatch

Innovations that guides you towards better health

Fitbit Sense smartwatch
Fitbit Sense smartwatch and Fitbit app in a phone

built in gps
Fitbit Versa 3
keep your workouts fresh and fun

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Battery life (in days) 
6+ 6+ 6+ 7 10
Water resistance
50m 50m 50m 50m 50m
Tracks activity & sleep
24/7 heart rate & AZM 
Text, call & app notifications 
Store & play music 
Hundreds of apps & clock faces
Alexa & Google Assistant 
Yes Yes Alexa Built-in No No
Built-in GPS 
Stress tracking w/ EDA sensor
ECG app & skin temperature 
High & low heart rate alerts
Meet Fitbit Sense—the advanced smartwatch that helps you tune in to your body and guides you toward better health. Assess your heart for atrial fibrillation (Afib) with a compatible ECG app right on your wrist, track & manage stress, better understand your sleep quality and even keep an eye on patterns in your skin temperature. Plus, Sense unlocks a 6-month free trial of personalized guidance and advanced insights from Fitbit Premium for new users.

Product details

  • Product Dimensions ‏ : ‎ 1.59 x 1.59 x 0.48 inches; 7.05 Ounces
  • Item model number ‏ : ‎ FB512SRSG
  • Batteries ‏ : ‎ 1 Lithium Ion batteries required. (included)
  • Date First Available ‏ : ‎ August 16, 2021
  • Manufacturer ‏ : ‎ Fitbit Inc

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