Try to get something with the more recent Bluetooth 5.1, or 5.0 at the least.
The new iFi Zen Air Blue has 5.1 but I'm not certain how it compares to the highly rated Zen Blue 2 which has 5.0.
Suggestions for Bluetooth device to hook up iPhone to amp
I’m wanting to be able to play music from my iPhone through my home stereo, so I’ll need some sort of Bluetooth device. I have an integrated amp with plenty of RCA inputs. I really don’t want to spend more than $300.00, but I will if needed. Looking for any suggestions. Thanks!