After using it for 1 month, I can say that doesn't have all the features of a new Sena intercom. I had problems with playing music and talking through intercom with my pillion. It doesn't work. I updated the firware, but still doesn't work. Otherwise, if riding alone does it's job well.
치수 표
A. 적절한 헬멧 사이즈를 결정하기 위해, 측정 밴드로 머리둘레가 가장 큰 지점(귀 위 약 1cm)을 측정합니다.