All the electric garage roller doors we supply are fitted as standard with an internal manual release mechanism that allows the curtain to be operated by hand in the event of a power failure.
Please note that this is only applicable to buildings with an alternate entrance. If no other access point is available, you will require an external manual release that will allow the door to be opened by hand from the outside in the vent of a power failure.
Depending upon the strength of signal and battery life, this will vary. As a rule of thumb, the maximum range of operation by remote control is approx 50 meters.
The inbuilt courtesy light is fitted with a timer that enables it to remain lit for approx 1 minute after you have entered or exited the garage.