The 38mm space gray anodized aluminum case with a black woven nylon band is both sporty and chic. Features on this watch include, Ion-X glass Retina display with Force Touch, composite 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 and watchOS 2.