A. The most important safety features in a garage door opener are:
Auto-reverse - If a garage door comes down and hits a person or car, then you want it to go back up again so as not to cause serious damage. Garage doors can be very heavy, and you don't want the full force of it pushing down on something that is trapped below it.
Manual control - It may seem counterproductive to have an automatic door installation and then add a manual operation as well, but if the power goes out in your home and you need to get the garage door open, you don't want to be pushing against a motor to try and open it. Emergencies can happen and sometimes the garage maybe your nearest point of exit from the house.
Safety lights. If you need to manually get your door open due to a power cut, then it's likely that the lights in your house won't be working either.