"earpiece" in the noun sense
1. earphone, earpiece, headphone, phone
electro-acoustic transducer for converting electric signals into sounds it is held over or inserted into the ear
"it was not the typing but the earphones that she disliked"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License