Resolution: 466 x 466 pixels, 60Hz High refresh rate
Bluetooth® phone call:When your phone receives a call, you can answer it on your watch with one touch and talk directly into the watch (Your watch must be connected to the phone)
Blood oxygen monitoring: All-day heart rate and SpO₂ monitoring
Straps: Xiaomi Watch S1 (Black), is with black leather strap and black fluororubber strap. Xiaomi Watch S1 (Silver), is with brown leather strap and grey fluororubber strap.