Display • 1.4-inch full circle AMOLED display • 0.6mm bezel • 400 x 400, 286ppi resolution • Scratch-proof sapphire crystal lens Dimensions • 1.4 inch watch face diameter • 11.3mm thick Weight • 61g with leather strap • 96g with stainless steel mesh strap • 131g with Stainless steel link strap Operating System • Android 4.3+ • iOS 8.2+ * • Supports OTA updates Connectivity • Bluetooth 4.1 BLE • Maximum10m Bluetooth range • Wi-Fi Memory • 512MB RAM + 4GB Flash Battery • 300mAh • 1.5 day (32 hours active, 8 hours asleep) • 75 minutes charging time Water resistant • IP67 Sensors • Gyroscope + Accelerometer • Heart rate sensor (PPG) • Barometer Software • Message notifications (calls, texts, emails, SNS, Google Hangout) • Voice interactions • Google Now • Maps • Sports and health • Music playback • Third-party apps from Google Play Store Watch faces • 40 watch faces pre-loaded • Classic, digital or sporty Straps • Leather • Compatible with 18mm standard straps Color • Stainless steel case *Supported features may vary between Android and iOS.