Apple Watch Series 2 has a water resistance rating of 50 meters under ISO standard 22810:2010. It uses the speaker for expelling residual water after a swim or after substantial immersion in water. It keeps track of lap data when swimming indoors and keeps track of distance swimming outdoors. During swimming the touch function can be disabled. It uses an Apple S2SiP (System in Package).,[3] a built-in quick-on GPS and a display with twice the brightness of the earlier model for easier readability outdoors.
