https://startupxplore.com/en/startups/silent-disco-party-headphones
Silent Disco Party Headphones profile at Startupxplore
silent discoparty headphonesprofile
https://www.bit-tech.net/news/tech/ipod-shuffle-locks-out-third-party-headphon/1/
New iPod Shuffle locks out third party headphones | bit-tech.net
Reportedly, the new iPod Shuffle will only function with the required first party headphones.
ipod shufflethird partybit technewlocks