H??ng d?n s? d?ng viên u?ng ??i Tràng ColMin h? tr? ng??i b? viêm ??i tràng, b?nh ??i tràng ch?c n?ngSporting activities recording: COLMI R02 smart ring can record your athletics position and let you know your athletics info always. Perspective complete particularsStainless steel shell: The COLMI R02 intelligent ring shell is product of chrome