Yes, you can use Echo Buds 2 without Alexa. Echo Buds 2 come with the Alexa app pre-installed, but you don't have to open the app and use Alexa if you don't want to. You can just use the earbuds like any other headphones. The Alexa app provides access to a number of features, including the ability to control playback, adjust volume, and get information about the song that's playing. But if you're not interested in using those features, you can just uninstall the app or leave it installed but disable the always-on listening feature.