Rolling Code Transmitters
Produced after 1996, rolling code transmitters change the coded signal each time the garage door opener is used. If there is no row of coded switches beneath the battery cover, it is a rolling code transmitter. For rolling code set-up instructions .
Fixed Code Transmitters
Produced prior to 1996, fixed code transmitters are manually programmed. To determine if your transmitter is fixed code, remove your battery cover. If there is a row of coded switches, it is a fixed code transmitter. For fixed code set-up instructions .