We are an oem pepair specializing in computers the classic audio and high end audio installin cars etc. Always looking for new lines we can sell. We are in aurora colorado since 1993 before that we were in denver colorado. Before i went out on my own i helped a company gold sound in englewood colorado design speakers for the home. Marantz audio bought back a stereo reciever i restored from a trash can and used it in a electronics trade show. We offer on request a doorbell that can play any sound. We can write any software one might need we program in c and c++ any more feel free to ask.