Specifications Case Diameter 35.4 mm Case Thickness 13.7 mm (bottom shell to screen) Weight Approx. 49 g (without strap) Body Material Microcrystalline zirconium ceramic, polycarbonate, stainless steel Strap Type Silicone strap Strap Length 120 mm (long), 75 mm (short) Strap Width 22 mm Display 1.39" AMOLED Resolution 454 x 454 Touch Screen Corning Gorilla third-generation tempered glass + anti-fingerprint coating Platform Qualcomm Snapdragon Wear 2500 Processor Quad-core 1.1 GHz Memory 512 MB LPDDR3 Storage 4G eMMC (approx. 1GB of available space) Network Type TDD-LTE / FDD-LTE, WCDMA, GSM Sensors BioTrackerTM PPG optical sensor, Acceleration sensor, Geomagne sensor, Ambient light sensor Connectivity Bluetooth 4.2 + BLE, Wi-Fi 2.4 GHz 802.11b/g/n Multiple Positioning GPS + GLONASS + GALILEO + WiFi Audio Speaker, microphone Battery 420mAh lithium-ion polymer battery (typical value) Charging Time Approx. 1.5 hours Charging Method magnetic / 4-pins POGO pin Battery Life Approx. 28 hours Water & Dust Proof Grade IP68 Supported Devices Android 5.0 or iOS10.0 and above Accessories Dedicated USB charging base App Zepp App (formerly known as the Amazfit App)