In descending order of size:

Earbuds/Earphones

Earbuds (American English) or Earphones (British English) are small headphones that are placed directly outside of the ear canal, but without fully enveloping it. They are generally inexpensive and are favored for their portability and convenience. However, due to their inability to provide isolation, they are not capable of......

Other risks arise from the reduced awareness of external sounds — some jurisdictions regulate the use of headphones while driving vehicles, usually limiting the use of earphones to a single ear. Also, most European countries have imposed high penalties since 2002 on drivers not using a headset while operating a mobile phone in a car, to ensure that drivers keep their hands on the vehicle's......

Headphones date from the beginnings of the history of the phone and the radio. The weak electrical signals of the early instruments were enough to operate only headphones audibly. Beyerdynamic is considered to have officially invented headphones in the late 1930s, and was the first company to market headphones to the public.

Headphones (also known as earphones, earbuds, stereophones,......