I’m starting a running program with my family. Part of the fun is building a shared playlist and listing to cues together. I’d like to run the audio off one phone and have it go simultaneously to 4 headsets. I see there’s phone apps that do today but my kids don’t have phones. Is there a hardware device that can do this?
Incoming infodump. I agree with another commenter that Auracast ist exactly what you want, problem: barely available.
Bluetooth is split into 2:
Bluetooth Classic
Bluetooth Low Energy
Auracast is a very new standard using BLE Audio. I’ve seen some aliexpress sellers selling Auracast hardware for silent discos. But from well known brands I haven’t seen a thing
Most BT headphones you buy use Classic, and cannot achieve multiple connections. So no built in solution.
Obviously there are proprietary Technologies that had custom transmitters/recievers for this exact usecase.
TLDR: If your Phone can do BLE Audio you could gamble on some Auracast hardware from aliexpress. Else, look for premade solutions not using Bluetooth