Makes mini speakers sound twice their size. Used for portable devices, such as MP3, DVD, CD and Cassette players, palm theatres, and Laptop computers. Great for motorcycle intercoms, NASCAR Scanners, travel books on tape, game systems... anywhere headphones or mini speakers are used. Gives a 12dB or 40% increase gain per channel with no increase in distortion. Also features a 12" cord, LED light which indicates when unit is turned on, and greater clarity and tone.