Two Vibration Motors - Feel the Action! Surround yourself in the video games, music, and movies you love with the LumiSource Pulse BoomChair! Features a pair of 3" 2-way speakers, a 4" sub-woofer, interactive vibration motors, wireless connection, rugged canvas surface with breathable padded mesh comfort zones, as well as an adjustable headrest. Adjustable vibration, volume and bass/treble. Folds for convenient storage. Easily hooks up to any video game system, DVD or CD player, or any portable MP3 device.