Beer Aerator - Sonic Foamer Uses Sound Waves To Create The Perfect Beer Head - Release The Full Aromatic Potential The Sonic Foamer makes beer taste better with a touch of a button, using a finely calibrated, ultrasonic vibration for the perfect foam head. The ultimate aromatic experience. Craft beer lovers will love it! Featured in craft taverns, pubs, bars and breweries all over the country! Sound waves release the bubbles through the bottom of the glass. Made through science, but looks like magic! Change light color to suit you. Spoon and Glasses not included. Requires 6 AA batteries (not included). 1 unit per order.