I've done this in the past which was a good affordable approach then decided to give the Flash to Open product a try.
Works well... and no batteries and a waterproof encased module you can connect to your high beams or signal lights to trigger the opener. You have to wire the receiver on your garage door opener but it should last a long time.
Works well... and no batteries and a waterproof encased module you can connect to your high beams or signal lights to trigger the opener. You have to wire the receiver on your garage door opener but it should last a long time.