The samsung galaxy watch4 classic (sm-r880, serial rfat62esprb), customized as "kirab's watch4 classic," is a 42mm bluetooth smartwatch released in 2021. it features a stainless steel frame, rotating bezel, and gorilla glass dx+ on a 1.2" super amoled display (396x396). powered by an exynos w920 (5nm), it has 1.5gb ram, 16gb storage, and sensors for heart rate, ecg, spo2, and bia. it runs wear os (upgradable to v4), supports samsung health, and offers 90+ workouts with a 361mah battery (40h mixed use). at 46.5g, it’s ip68 and mil-std-810g rated, with bluetooth 5.0, wi-fi, nfc, and gps. the app shows 58% battery at 7:32 pm eat, suggesting moderate wear. resale value is $50–$80 usd (2,000–3,000 etb) in good condition.