Question 1

I need to know if this product measures spo2 levels? that's the only reason i'm looking for a new device.

Accepted Answer

The Fitbit Sense measures Sp02 at night which is vital for my health. Also the alerts when your heartrate goes above or below certain numbers iis awesome. BEWARE: If you change the band to a designer band (I got the Pendleton Weave), it changes the fit, stopped giving me a sleep quality score, stopped measuring my Sp02 @ night. And I started earning 8X the floors I normally get. Lol Not so bad but I knew I didn’t earn the # of floors. Even though this question is 4 mos old, hopefully it will help someone else when choosing a band. The band that comes with the Sense isn’t very flexible. It rubbed a very sore place on my wrist bone.  I had a Charge 3. Chose a Sense after 3 pneumonias; one causing congestive heart failure and because I have 
SVTs. There are nice features to help me monitor these things & share with my physicians.

Question 2

Does it regiater 02 sats?

Accepted Answer

Yes... It measures SP02, but only at night while sleeping. That is when its important; when the heart is at rest. The Sense does measure the resting heart level. During the day, there is a relationship between breath rate and heart rate. The body calls for more 02 so the heart pumps faster for faster passage of blood through the lungs. You can see this relationship at HEART RATE. At the top there is a heavy white graph of the average resting rate. Swipe LEFT and you will get your cardio score. I have breathing issues sleeping and the Sense has helped me greatly.

Question 3

Is there a way to calibrate the heart beat? it is really inaccurate as measured by my charge 2, polar, kardia , anybody?

Accepted Answer

There is a whole thread on the Fitbit Community board with multiple users saying  how inaccurate the Sense is when measured by accurate heart monitors like the Polar chest strap and that the Sense is only accurate when you are inactive. So if you are just sedentary you are ok. But I've found that it is not as accurate as even the Charge 2.  So idk if it can be synced- I don't think so.

Question 4

If i buy this on amazon will the watch only come with alexa support or will it also have the google assistant support as well?

Accepted Answer

At the moment only Alexa is enabled on the watch. Next month there will be an update that enables Google, the ECG and probably SPO2 sensing without a specific watchface. Trust me - Fitbit is about to be owned by Google... Google Assistant will be at least offered on it regardless where you bought it. It's just they need to update the firmware to support it.

ASIN	B08DFCWVZ4
Age Range Description	Adult
Band Colour	Black
Band Length	180 Millimetres
Band Material Type	Stainless Steel
Band Width	1
Battery Average Life	6 days
Battery Capacity	266 Milliamp Hours
Battery Cell Type	Lithium Ion
Battery Charge Time	2 Minute
Battery Power	300
Best Sellers Rank	40,145 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 141 in Activity Trackers
Box Contents	Fitbit Sense, Classic wristband (both small & large), Charging cable
Brand Name	Fitbit
Case Material Type	Stainless Steel
Cellular Technology	Wi-Fi
Clasp Type	Push Button Deployant Clasp
Closure Type	Clasp
Colour	Carbon / Graphite Stainless Steel
Communication Feature	Bluetooth, GPS
Compatible Devices	Smartphone
Compatible Phone Models	Compatible with iOS 15 or higher and Android OS 9.0 or above
Connectivity Technology	GPS
Controller Type	Touchscreen Interface
Customer Reviews	4.3 4.3 out of 5 stars (14,112)
Display Type	AMOLED
GPS Geotagging Functionality	Built-in GPS
Human Interface Input	Microphone
Item Dimensions	40 x 40 x 12 millimetres
Item Dimensions D x W x H	5D x 16W x 5H centimetres
Item Type Name	Smartwatch
Item Weight	1.1 Ounces
Manufacturer	Fitbit
Memory Storage Capacity	6400 MB
Metrics Measured	Heart Rate, Stress, Body Temperature, Blood Oxygen or SpO2
Model Name	Sense Carbon/Graphite
Model Number	FB512BKBK
Operating System	IOS13+; Android 8+
Product Features	Stress Tracking, Activity Tracker, Body Temperature Monitoring, Heart Rate Monitor, Sleep Monitor, GPS, Oxymeter (SpO2)
Product Warranty	2 year manufacturer
Resolution	450 x 450
Screen Size	1.58 Inches
Shape	Square
Sim Card Size	eSIM
Sport Type	Exercise & Fitness, Running, Swimming, Walking, Water Sports
Style Name	Smartwatch
Supported Application	Heart Rate Monitor, Sleep Monitor
Supported Satellite Navigation System	GPS
Target Audience	Unisex Adults
UPC	811138036980
Unit Count	1.0 count
Water Resistance Depth	1 Metres
Water Resistance Level	Water Resistant
Waterproof Rating	ip67
Wearable Computer Type	Smart Watch
Wireless Compability	Bluetooth
Wireless Provider	du

Fitbit Sense Advanced Unisex Smartwatch with Tools for Heart Health, Stress Management & Skin Temperature Trends```

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