Apple Watch 38mm with stainless-steel hyperlink Bracelet. chrome steel or space black chrome steel case Sapphire crystal Retina display with pressure contact Ceramic back virtual Crown coronary heart charge sensor, accelerometer, and gyroscope Ambient light sensor Speaker and microphone wi-fi (802.11b/g/n 2.4GHz) Bluetooth 4.zero as much as 18 hours of battery lifestyles* water-proof** *Battery life varies by using use and configuration; actual results will range. See /batteries and /watch/battery.html for extra statistics. **Apple Watch is splash and water-resistant but now not water-proof. you can, as an example, wear and use Apple Watch at some point of exercising, inside the rain, and whilst washing your arms, but submerging Apple Watch isn’t encouraged. Apple Watch has a water resistance rating of IPX7 beneath IEC wellknown 60529. The leather-based bands aren’t water resistant.