It is a small device that is placed inside the ear to perform sound reception. It is also often called pinganillo. It is a means of intercommunication used in simultaneous translations or between members of sports teams. In some cases they are medically formulated to help people with hearing loss.
It is a device that is used in the ear to allow the listening of distant or low-intensity sounds; they usually use a transducer and an amplifier circuit. It is an aid for people with hearing loss ("hearing impairment"). The word is formed by the Latin voice audire ("to hear") and the suffix -fono ("sound voice").