Stainless steel case Sapphire crystal Retina display with Force Touch Ceramic back Heart rate sensor, accelerometer, and gyroscope Ambient light sensor Speaker and microphone Wi-Fi (802.11b/g/n 2.4GHz) Bluetooth 4.0 Up to 18 hours of battery life* Water resistant** **Apple Watch is splash and water resistant but not waterproof. You can, for example, wear and use Apple Watch during exercise, in the rain, and while washing your hands, but submerging Apple Watch is not recommended. Apple Watch has a water resistance rating of IPX7 under IEC standard 60529. Features are subject to change and may not be available in all regions or all languages. Requires iPhone 5 or later.
Ion-X glass; Retina display with Force Touch
Heart rate sensor, accelerometer, and gyroscope
Wi-Fi (802.11b/g/n 2.4GHz); Bluetooth 4.0