Colmi R03 Smartring Size 8 (R03-GO-8)

The Colmi R03 18.1MM size 8 smart ring is a lightweight, compact health and fitness tracker. It monitors heart rate, sleep quality, blood oxygen, counts steps and calories, offers water resistance, and comes with a charging case.

Specifications:

• Ring diameter: 18.1 mm

• Ring size: 8 (internal circumference approx. 56-57 mm)

• Weight of ring_ 4.7 g

• Material: titanium alloy

• Wireless_ Bluetooth 5.0

• Ring battery: ~15 mAh, magnetic charging

• Operating time (ring): ~3-5 days

• Charging case battery: ~200 mAh, USB-C charge port

• Water resistance: 5 ATM