Use a beam of light to send your music to the other side of the room! Attach the audio output of an iPod or CD player to the laser and shine the beam onto a solar cell attached to an amplifier several meters/yards away. Amazing to hear the sound created by slight variations (modulation) in the intensity of the laser! Includes a Red Laser Pointer, electrical harness, and amplifier with attached photocell. Music player and batteries not included. Requires 2 AA batteries.