I use the Bluetooth module in my TANDEM X20 transmitter primarily for my mini Bluetooth headphones. This way, I avoid that fellow pilots are disturbed by the warning tones and voice announcements.
As mini Bluetooth headphones I use the "Xiaomi LYEJ05LM".
This mini Bluetooth headphones was immediately recognized by my TANDEM X20 transmitter without any problems!
Works flawlessly for several hours.
The connection to the transmitter does not always have to be re-established, but remains.
Very good product!