??Good Night, Ur Light?? is a hypersonic sound speaker. Because of hearing deterioration of aging, the elderly need louder voice than the young. Through ??Good Night, Ur Light??, they can set the most comfortable volume for themselves without disturbing others. Combing with the newly technology called ??Directional Loudspeaker?? with special frequency that the vioce can only be heard in the limited direction and space. Two Pieces of ??Good Night, Ur Light?? can supply perfect stereophony. Each of speaker can affords individually hearing to elder??s left and right ears Therefore, it can make the stereo more pure and enjoyable.