You will find 4 main companies that sell BT stethoscopes. They are -
Thinklabs.
Thinklabs One - Digital Stethoscope?
Littmann
https://www.littmann.com.au/3M/en_AU/littmann-stethoscopes-au/advantages/core-digital-stethoscope/
Eko
Amphl
You can find new ones around as well but I’m just not familiar with them.