You will need to research your particular model--there's probably a model number listed on the opener.
here is a link to the various owner manuals available on line:
http://chamberlain.custhelp.com/#s=eyJzZiI6eyIxNzYiOnsiZmlsdGVycyI6eyJub190cnVuY2F0ZSI6MCwicGFnZSI6MSwic2VhcmNoVHlwZSI6eyJmaWx0ZXJzIjp7ImRhdGEiOjV9fSwia2V5d29yZCI6eyJmaWx0ZXJzIjp7ImRhdGEiOiJsb29zZSBkcml2ZSBiZWx0In19LCJwIjp7ImZpbHRlcnMiOnsiZGF0YSI6eyIwIjpbXX19fSwiYyI6eyJmaWx0ZXJzIjp7ImRhdGEiOnsiMCI6W119fX0sInNvcnRfYXJncyI6eyJmaWx0ZXJzIjp7ImRhdGEiOnsiY29sX2lkIjotMSwic29ydF9kaXJlY3Rpb24iOjF9fX19fX0sImMiOjJ9
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