Christmas grooves comin' at ya in full effect! This insanely cool device plugs into your regular Christmas Tree lights and responds to the ambient sound of its environment. The lights will groove to the beat of any music playing and even the pure and glorious sounds of real singing. It will be a fantastic light show that's never the same. You will watch in amazement as it evolves to every new musical source. Make sure the carolers at your place tonight because they've never seen lights like yours before!