a wireless method and apparatus for transmitting signal , for example , from a source , to headphones or speakers , while allowing relatively unrestricted range of movement / placement for the headphones or speakers . an infrared transmitter diverges its signal by passing the signal through a concave lens . the signal is processed to bounce off of objects , such as , walls , ceilings and floors before reaching the receiver on the headphones / speakers . the receiver has a convex lens affixed to it , so as to converge the transmitted signal . the signal is polarized so that ambient light is filtered .