clip-on

nouns

a device (as an earring, sunglasses, microphone etc.) that is attached by clips
clip-on
is a type of (narrower)
an instrumentality invented for a particular purpose
"the device is small enough to wear on your wrist"; "a device intended to conserve water"
device

adjectives

attachable by a clip
"clip-on earrings"; "a clip-on bow tie"
clip-on
is similar to
capable of being fastened or added to something else
"a handle attachable by two bolts"
attachable