1.4 "(34.5mm) Super AMOLED, 450 x 450 pixels (~321 ppi density), 16M Colors, CPU: Dual-Core 1.15GHz, 361mAh Battery, Android Wear OS, One UI Watch 3, Bluetooth, Wi-Fi
The Galaxy Watch4 Classic uses red LEDs and infrared rays to calculate your SpO2 levels or the amount of oxygen in your blood.
Glass front (Gorilla Glass DX+), MIL-STD-810G compliant, 50m water-resistant (IP68), Compatible with standard 20mm straps, ECG certified, Blood pressure monitor
5 ATM / IP68 The water and dust resistance rating, Military-grade durability, Larger screen but lighter and thinner for more comfort.