This learning keyfob allows you to clone 2 extra remote control fob to your family or just for alternate. 4 button design allows you to control up to 4 garage door openers or 4 different function of keys. Handy key chain, easily attaches to your car keys, convenient to carry. It can copying all kinds of 433MHz(433.92MHz) frequency fixed code remote control (Rolling codes can not be cloned). Suitable for many kinds of cars, electric gate, doors, garage doors and anti-theft alarm etc.