As long as the hearing on both sides declines, it is recommended to wear it in both ears. There is little difference in wearing a single ear in a quiet environment, but there will be obvious differences in a chaotic environment and a complex environment. Moreover, binaural listening is relatively balanced, and it has a positioning function, which improves the speech resolution in complex environment, eliminates the projection effect, integrates binaural loudness, reduces the ear blocking effect, and prevents unilateral hearing fatigue. It is recommended to wear both ears according to your own hearing.