Chamberlain KLIK1U Transmitter Universal Garage Door Remote Control for 2 Openers for $19.99. Shipping is free on orders over $35. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for your reference. The product information claims that it works with 99.9% of garage door openers and features Smart Learn button, and can be used for two garage openers. As a comparison, Home Depot currently has it for about $34.