Samsung Galaxy Watch4 smartwatch, 46mm, BT, Classic, SILVER Features and technical details: Stainless steel case; Case dimensions and weight: 45.5 x 45.5 x 11.0 mm, 52g; Technology: BT; Display: 1.36" (35mm) 450x450 Super AMOLED, Full Color Always On Display, Corning® Gorilla® Glass DX; Processor: Exynos W920 Dual Core 1.18Ghz (5nm Processor); Memory: 1.5GB RAM + 16 GB internal storage; Battery: 361 mAh, wireless charging based on WPC; OS: Wear OS Powered by Samsung; UI: One UI Watch 3; Sensors: Samsung BioActive sensor (optical heart rate + electrical conduction of the heart + bioelectrical impedance analysis), accelerometer, barometer, gyroscopic sensor, geomagnetic sensor, light sensor; Connectivity: Bluetooth 5.0, Wi-Fi 802.11 a/b/g/n 2.4+5Ghz, NFC, GPS/Glonass/Beidou/Galileo; Durability: 5ATM + IP68 / MIL-STD-810G; Compatibility: Android 6.0 or higher recent and with more than 1.5 GB of RAM * Device activation is only available after connecting to a smartphone that supports Google Mobile services.