Apple Watch Sport 42mm Stainless Steel Case with Red Sport Band Stainless steel or space black stainless steel case Sapphire crystal;Retina display with Force Touch;Ceramic back Digital Crown;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