For tagging purposes, this covers small speakers with a hook design meant to be held by the ears, i.e. not held in place by a headband (compare: headphones). Also includes earbuds, which are placed over the ear canal and also requires no headband, this type of device is popular with digital media players like the iPod.
Images where a character's ears are covered up, but there are visible earphone cable leading to them and no visible headphone band present can also be tagged earphones.
For devices with only one speaker, see earpiece.