COLMI R02 10 black with charging case

The COLMI R02 is a lightweight smart ring in black, size 10 (19.8 mm), combining 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. Via Bluetooth 5.0 it syncs data with the QRing app.

Weighing just 4.7 g and 2.7 mm thick, the ring is barely noticeable on the finger. It does not restrict hand movement, so it stays comfortable during writing, manual work or exercise, and can be worn day and night. Measurements run automatically in the background.

The IP68 rating means the ring can stay on during hand washing or contact with water. The included charging case doubles as a docking station, and the manufacturer quotes 6 to 7 days of battery life per charge.