Best 40mm Smartwatch

Apple Watch Series 9 [GPS 45mm] Smartwatch with Pink Aluminium Case with Light Pink Sport Band. Fitness Tracker, Blood Oxygen & ECG Apps, Water-Resistant - M/L

Smart Watch for Men Women [Answer/Make Call], 1.8" Touchscreen Fitness Tracker with Heart Rate Blood Oxygen Sleep Monitor Compatible with iPhone & Android, Alexa Built-in, IP68 Waterproof Watch

Apple Watch SE (2nd Gen) [GPS 40mm] Smartwatch with Midnight Aluminium Case with Midnight Sport Loop. Fitness & Sleep Tracker, Crash Detection, Heart Rate Monitor, Water-Resistant - One Size

Fitbit Versa 4 Fitness Smart Watch for Men and Women with Daily Readiness, Gps, 24/7 Heart Rate, 40+ Exercise Modes, Sleep Tracking and More, Black/graphite, One Size (S and L Bands Included)

Smart Watch for Women with Bluetooth Call Answer/Dail,1.9'' HD Full Touch Screen Fitness Tracker, Smartwatch with Heart Rate Blood Oxygen Sleep Monitor for Android and iPhone

Smart Watch for Men Women with Bluetooth Call, Alexa Built-in1.8 DIY Dial with Blood Oxygen Heart Rate Sleep Fitness Tracker Notification Weather 100 Sport Modes Smartwatch for Android iOS Phone

Samsung Galaxy Watch7 Smartwatch, 40mm, Fitness Tracking, BioActive Sensor, Personalized Sleep Coaching, LTE – Forest Green (CAD Version & Warranty)

Smart-Watch-with-Alexa-Built-in, 100+ Fitness Tracker Smartwatch, IP68 Waterproof, Health Monitor for Heart Rate, Sleep, 24/7 Blood Oxygen & Stress, Smart Watch for Android and iPhone, Blue

TOOBUR Smart Watch for Men Women, Alexa Built-in, Answer/Make Calls, 1.91" HD Screen Fitness Watch, IP68 Waterproof, Heart Rate Monitor, Sleep Tracker, Smartwatch Compatible Android iOS, Blue

LIGE Military Smart Watch, 1.39'' HD Tactical Smart Watch for Men with Bluetooth Call/Heart Rate/Blood Pressure/Sleep Monitor, Sport Watch with 21 Sport Modes, IP68 Smartwatch for iOS Android, Black