clip-on
adjectiveUK /ˈklɪp ɒn/
US /ˈklɪp ɑːn/
A clip-on thing is something you attach by pinching it on, not by tying or sewing it.
She wore clip-on earrings to the party because she doesn't have pierced ears.
OTHER MEANINGS
2. A small device that clips onto something to hold it in place.
He used a clip-on light to read his book in the dark.
3. A piece of jewelry attached with a clip rather than a piercing.
My grandmother gave me a pair of clip-on earrings.
4. A tie or bow tie that fastens with a clip instead of being tied.
The little boy wore a clip-on tie to the wedding.
5. Designed to be attached temporarily and removed easily.
The clip-on lens turned his glasses into sunglasses.