... with audio output such as full channel TV sound, PC, game player, DVD Player, VCD Player, audio device, MP3 Player, and CD ... audio out socket, such as TV set, audio device, DVD/VCD Player, multimedia, PC, MP3, Walkman, etc.Power supply: 2*AAA batteries ... the volume of the signal source (TV set, VCD Player, DVD Player, PC, MP3, Walkman ect) to a lower level, and reception ...