Why Some Earphones & Headphone Jack Have 1, 2 Rings while other have 3 ?

Why Some Earphones & Headphone Jack Have 1, 2 Rings while other have 3 ?

Why Some Earphones & Headphone Jack Have 1, 2 Rings while other have 3 ? Why Some Earphones & Headphone Jack Have 1, 2 Rings while other have 3 ? مقاطع الفيديو ذات الصلة