The ELK-129 Computer Sound Card Interface allows a computer's speaker output to be used as one of the tools for programming the ELK Recordable Modules, such as the ELK-120, ELK-124, or ELK-MV480. The included shareware software is used to process your computer's audio files for use with the ELK-129. The ELK-129 then 'downloads' the processed files to the Recordable Module. Finished messages can be saved on your computer's hard drive for re-use.