Hey Ray not to thread Jack but I have a lot of experience in the garage door industry, if you need any pointers on legal requirements for remote operating systems shoot me an email. At the very least UL325 compliance in the US will help fast track any commercially available product virtually worldwide. Light and sound alarms are usually the part that slows residential acceptance. I also have a lot of experience installing accessory devices on all major opener brands, so I could also provide help with how-tos and directions.
Just shoot me an email, or private message if I can be of assistance.