advantage
1: The sound field is good, the sound quality is very good, and the comfort is good.
2: Do not enter the ear to avoid scratching the ear canal.
3: Compared with in-ear earplugs, it protects the tympanic membrane.
shortcoming
1: Summer is a bit sultry
2: Inconvenient to carry
3: If the sound insulation is too good, danger will easily occur on the road.
