Echo Sub - Powerful subwoofer for your Echo for $130

Feature :

• Echo Sub delivers down-firing, 100W deep bass sound through a 6" woofer.
• Pair with one Echo or Echo Plus (sold separately) to enjoy dynamic music that fills the room.
• Pair with two of the same Echo devices for rich left/right stereo sound.
• Simple to set up and use—just plug in, open the Alexa app, and wirelessly connect to your Echo device(s) to control music with your voice.