COLMI R02 12 black with charging case

The COLMI R02 is a black smart ring in size 12 (21.3 mm) that combines health monitoring with sports tracking. It measures heart rate and blood oxygen saturation (SpO2), analyses sleep and tracks daily activity and workouts across 21 sport modes. Weighing 5 g and just 2.7 mm thick, it is light and discreet enough to wear around the clock.

Measurements run automatically in the background and are stored in the ring's memory, so data is kept even when your phone is not with you. Bluetooth 5.0 connects the ring to the QRing app, which presents the results in a clear format. With an IP68 rating, the ring can be worn while washing hands, exercising or in contact with water.

The included charging case doubles as a storage box and docking station, using magnetic contacts. According to the manufacturer, the ring's battery lasts six to seven days, and a full charge takes around one hour. The ring is compatible with Android 4.4 and later, iOS 8.0 and later, and HarmonyOS.