Question 1

Does it take blood pressure?

Accepted Answer

It does have a blood pressure /EKG app. The BP app has to be calibrated with a good cuff BP monitor. The accuracy is so-so. The app only works if the watch is paired with a Samsung phone, although there are hacks available to get the app working with other android phones. I have my Galaxy Watch 4 paired with my OnePlus 9 phone and the hacked version of the Samsung Health Monitor app. My evening BP using the Galaxy Watch 4 Health monitor app was 104/61. Taking my BP with my Wellue digital cuff BP monitor on the opposite arm was 115/64. Taking my BP with my Omron wrist cuff BP monitor on the same wrist as the watch was used was 115/65.  It's 122 using my Viatom Health Monitor Pro device. Overall the accuracy is "fair." The EKG function only looks for a-fib, but that is the most common arrhythmia. The watch also has a Sp02 function. I actually bought the watch because I needed it for monitoring my continuous glucose monitor (Dexcom  G6). Dexcom makes a special watchface/app for the watch that shows the current blood glucose level and has alert settings for lows and highs.

My only complaint about the watch is the battery life. I have to charge it twice a day - usually first thing in the morning while I'm having breakfast and then an hour or so before bedtime. I do wear the watch at night to track sleep apnea issues and to alert me if my blood glucose drops below a safe threshold.

Question 2

What does country or origin mean?

Accepted Answer

No if you have an iPhone get an apple watch

Question 3

Is this  compatible with the A21?

Accepted Answer

I'm not sure I found this information. Hope it helps
These devices will still have support on older Samsung phones but not the new Galaxy S21 series. According to a report by Galaxy Club, older Samsung smartwatches and fitness trackers will not be compatible with the Galaxy S21 series.Dec 5, 2022

Question 4

Does it work for galaxy A13?

Accepted Answer

It should.  It works via Bluetooth to Samsung phones.

ASIN	B09MV31BQM
Additional Features	GPS
Age Range Description	Adult
Band Color	white
Band Material Type	Aluminum
Battery Capacity	247 milliamp_hours
Battery Cell Composition	Lithium Ion
Battery Cell Type	Lithium Ion
Battery Power	247 milliamp_hours
Best Sellers Rank	#19,019 in Amazon Renewed ( See Top 100 in Amazon Renewed ) #328 in Men's Smartwatches #552 in Renewed Smartwatches #4,101 in Smartwatches
Brand	Samsung
Built-In Media	Compatible charger
Case Material Type	Aluminum
Cellular Technology	4G
Clasp Type	Buckle
Closure Type	Buckle
Color	Silver
Communication Feature	True
Compatible Devices	Smartphone
Compatible Phone Models	Various Android models
Connectivity Technology	Bluetooth, Cellular , GPS, Wi-Fi
Controller Type	Google Assistant
Customer Reviews	4.2 out of 5 stars 530 Reviews
Display Type	AMOLED
GPS Geotagging Functionality	True
Human Interface Input	Touchscreen
Item Dimensions	6 x 4 x 4 inches
Manufacturer	Samsung Electronics
Metrics Measured	Optical Heart Rate Sensor
Model Name	galaxy
Model Number	SM-R865
Operating System	Android
Resolution	396 x 396
Screen Size	40 millimeters
Shape	Round
Sim Card Size	eSIM
Special Feature	GPS
Sport Type	Fitness, Running
Style Name	Modern
Supported Application	GPS, Sleep Monitor
Supported Satellite Navigation System	GPS
Target Audience	Unisex Adult
UPC	686457982344
Warranty Description	30 days
Warranty Type	Limited
Water Resistance Depth	50 meters
Water Resistance Level	Water Resistant
Waterproof Rating	IP68
Wearable Computer Type	Smart Watch
Wireless Communication Standard	Bluetooth
Wireless Compability	Bluetooth
Wireless Provider	Unlocked

Samsung Galaxy Watch4 Aluminum Smartwatch 40mm LTE - Silver (Renewed)

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