Amazon.com: Ear-Clip Bone Conduction Headphones Bluetooth 5.3, Painless Wireless Open Ear Clip on Earbuds,Waterproof Mini Sport Running Earring Earphone, Noise Cancelling/HiFi Quality/Long Battery Life : Electronics
Bluetooth Audio Receiver | BTFreq Clip
ATH-EM9r | Audio-Technica
This clip-on audio receiver turns any wired earbuds/headphones into wireless ones - Yanko Design
Amazon.com: Clip on Headphones Bluetooth V5.3, Open Ear Earphones Wireless with Earhooks, Ear Clip On-Ear Headphones, Sports Headset Bluetooth with 4 Microphones, Noising Cancelling/Long Battery Life(Black) : Electronics