Blue neon moves up and down these antenna-like tubes to create a light experience that matches your music. The antenna positions can be adjusted independently for your perfect position, and you can also set the neon to constant on to fill the tubes without any sound to activate them. Control sound sensitivity with the easy to operate knob. Supplied with a 12V adapter, it can be plugged in. Size: 8 ½”, 2 ½” x 2 ¼”.