2pcs Headset Headphones Fast Helmet Rail Adapter Rail Adapter Functionality Headphones Cord Helmet Rail

Mountain bike accessories: take out the wire of headphones
Goggle equipment: buckle the earmuff on the hanging buckle of this rail adapter (corresponding location, both left and right)
Helmet headphones: wire the headset on the of the helmet according to your own situation, then fix it on the of the helmet
Headphone helmet: and
Helmet rail for: remove the earmuffs on the two sides of the earphone from the stand