For sale, the smart watch Samsung Galaxy Watch 4 (The watch is the basic version, not the classic one) Supports Google apps and electronic payments Operating System: Wear OS, supports Google apps Supports Google Pay and Google Wallet feature Size: 40 mm Health: Contains a BioActive sensor to measure (heart rate, ECG, and body composition analysis "fat and muscle percentage"). Screen: Super AMOLED, which is one of the best screens in its price category to date Advanced health sensors: Measures heart rate, blood pressure, and ECG. Body Composition Analysis (BIA): Measures body fat, muscle, and water percentage (a Samsung exclusive feature). Accurate sleep tracking, blood oxygen level, and walking and sports tracking