Samsung Galaxy WatchSamsung Galaxy Watch Active 2
Tech specs 
Size46mm version (46 x 49 x 13 mm)
42mm version (41.9 x 45.7 x 12.7 mm)
40mm and 44mm variant
MaterialStainless steel casingStainless Steel (Bluetooth version) or Lightweight Aluminum design (LTE models)
ChargingWPC based wireless chargingWPC based wireless charging
Battery46mm version (472 mAh)
42mm version (270 mAh)
40mm: 247mAh
44mm: 340 mAh
Battery life46mm version (up to 7 days)
42mm version (up to 3 days)
Between 1 and 2 days (depending on use)
Water-resistance5 ATM5 ATM
Weight46mm version (63 grams)
42mm version (49 grams)
40mm: 26 grams (Aluminium case)
44mm: 30 grams (Aluminium case)
SensorAccelerometer, Barometer, Gyro Sensor, HR Sensor, Light Sensor, GPS (Glonass,Beidou,Galileo), NFCHeart Rate Monitoring (with 8 Photodiodes), Electrocardiogram (ECG), Accelerometer (measure up to 32g of force), GPS (Glonass,Beidou,Galileo), NFC. There's also an LTE model.
DisplayCircular Super AMOLED (360 x 360)
Full Color Always On Display
Corning® Gorilla® DX+
Super AMOLED
Screen size46mm version (1.3 inch)
42mm version (1.2 inch)
40mm: 1.2-inch S-AMOLED display (360 x 360 pixels resolution)
44mm: 1.4-inch S-AMOLED display (360 x 360 pixels resolution)
ColorsSilver, Midnight Black, Rose GoldVarious
OtherOperating system: Tizen 4.0
Processor: Exynos 9110 Dual core 1.15GHz
Memory: LTE: 1.5GB RAM + 4GB Internal Memory; Bluetooth: 768MB RAM + 4GB Internal Memory
Connectivity: 3G/LTE, Bluetooth®4.2, Wi-Fi b/g/n, NFC, A-GPS/Glonass
Operating system: Tizen
Processor: Exynos 9110 Dual core 1.15 GHz
Memory: 768MB and 1.5GB of RAM (LTE model)
Connectivity: Bluetooth® 5.0, Wi-Fi b/g/n, NFC, A-GPS/GLONASS/Galileo/Beidou
Activity tracking 
StepsYesYes
DistanceYesYes
Calories burnedYesYes
ActivityYesYes
FloorsYesYes
SleepYesYes
Heart rateYesYes
Stress & recoveryYesYes
Pulse Ox
Respiration rate
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intakeYes (through the app)Yes (through the app)
GPSYesYes
Running features
Swimming features
Other - there is a Bluetooth and LTE version of the watch- ECG
- Fall alerts?
- Monitors blood pressure through an optional research app.
Non-fitness functions 
Smartphone notificationsYesYes
On-board music storageYesYes
Connected payYesYes
LTEYesYes (selected models)
Links 
Affiliate link*Amazon | SamsungAmazon | Samsung
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