The default codec is aptx. There are others available to choose in developer options like aac, ldac or samsung hd but not aptx-hd, maybe the phone is not provided with the hardware or the samsung update to run it, but definitely Oreo enables all the codecs for compatible hardware.

I received mine couple days ago and I couldn't be happier with this little device, the sound is very detailed, the voices are clear, everything sounds real. The Android app is well made and works without problems, the Eq is simple usable and functional. Updating the firmware was little trouble...

The se215 has better isolation and very good instrument separation. Ie80 better in vocals and bass. Very difficult find everything in one iem. Is not a big step from se215 I think.

I got both, I can tell you the shure 215 will not disappoint, not much difference between ie80 and the se215. I found just the ie80 a little bit better in vocals