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Amazon has the Chamberlain MYQ-G0402 Smart Garage & Door Control Sensors for $ 19.99 with free shipping for Prime members, or on orders of $ 25+
Product Info:[list][*]Smart Garage Control is limited to controlling two garage door openers.[*]Add the ability to monitor, open and close a second garage door opener with Smart Garage Control.[*]Mount to inside top panel of garage door and add to your existing myQ account through the myQ App.[*]Chamberlain MYQ-G0402 works with the new Smart Garage Control (MYQ-G0401,MYQ-G0401 – E and 821LMC), and Smart Garage models’ (MYQ-G0201 & 821LM) and Smart Garage Hub (MYQ-G0301,MYQ-G0301-E,MYQ-G0301-D,MYQ-G0301C,MYQ-G0301LA,821LMB). Each sold separately.