When you delete an face watch how do you reset the storage space to see the actual storage capacity?

There is a App you can download in the smartphone app that measures storage space

Are the sensors for blood oxygen etc. upgraded in this watch from the previous version?

Yes, The Amazfit GTR 4 debuts the new BioTrackerTM 4.0 PPG biometric sensor. Enhanced to 2LED, the sensor collects 33% more data and is more accurate than the previous generation, thanks to the ultra-thin 0.4mm glass base. This sensor, combined with the watch's upgraded heart rate tracking algorithm, greatly reduces potential signal interference caused by arm movement during exercise, for heart rate tracking that almost reaches the level of heart rate belts.

Can you reply to messages and phone calls?

This answer applies to the new Gtr 4 MINI. I don't know how they can have reviews and answers from months ago for a watch version that just came out March, 2023. This GTR 4 Mini is brand new so MY answer applies to this new version. You can also go into the Zepp app and add or delete messages. I've already done that since most of the prewritten messages didn't apply to my situations.

The gtr 3 has a compass, is there one in the gtr 4?

Yes the GTR 4 also has a compass

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Specifications

ASIN	B0B8YR3KZS
Additional Features	Accelerometer, Activity Tracker, Blood Pressure Monitor, Body Temperature Monitor, Contactless Payments, ECG, GPS, Heart Rate Monitor, Phone Call, Stress Tracking, Universal
Age Range Description	Adult
Band Color	black
Band Material Type	Aluminum Alloy,Stainless Steel
Battery Average Life	14 days
Battery Capacity	475
Battery Cell Type	Lithium Polymer
Battery Charge Time	120 minutes
Best Sellers Rank	#89,079 in Electronics ( See Top 100 in Electronics ) #183 in Men's Smartwatches #1,635 in Smartwatches
Brand	Amazfit
Built-In Media	Charging Cable, Smart Watch, User Manual
Case Material Type	Aluminum
Cellular Technology	LTE
Clasp Type	Tang Buckle
Closure Type	Buckle
Color	Superspeed Black
Communication Feature	Notifications
Compatible Devices	Android 7.0 and above, iOS 12.0 and above
Compatible Phone Models	Android Phones, Samsung, iPhone
Connectivity Technology	Bluetooth, Wireless
Controller Type	Voice Control
Customer Reviews	4.4 4.4 out of 5 stars (3,170)
Display Type	AMOLED
GPS Geotagging Functionality	GPS Enabled
Human Interface Input	Touchscreen
Item Dimensions	5.91 x 2.76 x 5.12 inches
Item Type Name	Smart Watch Fitness Tracker
Item Weight	34 Grams
Manufacturer	Amazfit
Memory Storage Capacity	2300 MB
Metrics Measured	Heart Rate Monitor, Blood Oxygen Monitor, Stress Monitor
Model Name	gtr
Model Number	A2166-SUPERSPEED BLACK
Operating System	Zepp OS
Resolution	466 x 466
Screen Size	1.43 Inches
Shape	Heart
Sport Type	Basketball, Cycling, Snow Skiing, Swimming, Yoga
Style Name	GTR Mini
Supported Application	Fitness Tracker, Music Player, Phone, Social Media, Voice Control
Supported Satellite Navigation System	GPS
Target Audience	Unisex Adults
UPC	850037656905
Warranty Description	1 year manufacturer
Warranty Type	Limited
Water Resistance Depth	50 Meters
Water Resistance Level	Water Resistant
Waterproof Rating	IP68
Wearable Computer Type	Smart Watch
Wireless Compability	Bluetooth
Wireless Provider	Unlocked

Amazfit GTR 4 Smart Watch for Men Android iPhone, Dual-Band GPS, Alexa Built-in, Bluetooth Calls, 150+ Sports Modes, 14-Day Battery Life, Heart Rate Blood Oxygen Monitor, 1.43”AMOLED Display,Black

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