Specification : Brand : Amazfit Model Name : Amazfit GTS 2 Mini Screen : 1.55" AMOLED Display Resolution : 354 x 306, PPI 301 Dimensions : 40.5 x 35.8 x 8.95 mm (without sensor base) Weight : 19.5 g (without strap) Body : Aluminum Alloy Strap Material : Silicone Strap Width : 20 mm Water Resistant Levels : 5ATM Speaker : NO Microphones : YES Connectivity : Bluetooth 5.0 BLE Positioning : GPS + GLONASS Battery : 220mAh Lithium-ion Polymer Battery Battery Life : 21-Days (Basic Usage) | 14-Days (Typical Usage) | 7-Days (Heavy Usage) Supported Devices : Android 5.0 or iOS 10.0 and above App : Zepp App (formerly known as the Amazfit App)