Best smart ring

14, 2023, 2.8 mm, Temperature sensor, Built-in heart rate monitor, Phone functionality (SIM card), Pedometer, Sleep measurement, Heart Rate Variability, Blood oxygen

2024, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, Temperature sensor, Built-in heart rate monitor, Pedometer, GPS, Sleep measurement, Blood oxygen

10, Temperature sensor, Pedometer, Sleep measurement