which apple watch is right for you? compare all models > | thời trang from $399 apple watch se from $279 from $199 44mm or 40mm case size 44mm or 40mm case size 42mm or 38mm case size always-on retina display retina display retina display gps + cellular gps gps + cellular gps gps blood oxygen app? ecg app high and low heart rate notifications irregular heart rhythm notification high and low heart rate notifications irregular heart rhythm notification high and low heart rate notifications irregular heart rhythm notification supports family setup supports family setups water resistant 50 meters water resistant 50 meters water resistant 50 meters buy buy buy learn more > learn more > learn more >