An earpiece is a small device that you wear in your ear to listen to audio, such as music or phone calls, without others around you hearing it. Full definition
Some iPhone X users are reporting that they are experiencing «crackling» or «buzzing» sound from the device's front - facing earpiece speaker at high or max volumes. (iphonehacks.com)
The headphones have a water - resistance rating of IPX5, and are sold with two types of earpieces in three different sizes. (thewirecutter.com)