Depending on how old the Chamberlain openers are you could go with the MyQ package. LiftMaster MyQ Package
and a second 888LM. I just set this up for my 2 openers and it works great so far using [WITHDRAWN] MyQ LiftMaster/Chamberlain
Depending on how old the Chamberlain openers are you could go with the MyQ package. LiftMaster MyQ Package
and a second 888LM. I just set this up for my 2 openers and it works great so far using [WITHDRAWN] MyQ LiftMaster/Chamberlain