From the manufacturer

Active Noise Canceling: Two microphones detect ambient noise while Active Noise Canceling blocks unwanted sound. Background noise can be reduced up to 98% to keep you fully immersed. Tune into or out of the world around you with an easily adjustable three-level ambient sound option.
Dynamic 2 way speakers: Well balanced sound experience – from deep bass to clear treble. Well-Balanced Sound
Crystal-clear calls: Three microphones and a built-in voice pickup unit help you make clearer calls, while a machine-learning based solution filters unwanted sound.
Comfort Fit: Galaxy Buds2 is lightweight (5g each) and keeps music snug in your ears for even the most active lifestyles. With three sizes of soft, flexible silicon tips you can find a custom fit to get the best ANC experience possible.
Sound Customization: Tailor your audio experience with six different equalizer settings.
Long lasting battery life: keeps you connected and comfortable all day long. Gives you up to 5 hours of play-time and 15 more with a fully charged case.
Smooth Syncing: With Auto Switch, moving between your Galaxy devices is easier than ever.