The LiftMaster 412HM Universal Coaxial Receiver is a Security+ 390 MHz radio receiver designed to add or restore rolling‑code remote control to garage door openers, gate operators, and access control systems. It’s commonly used as a replacement receiver or as an upgrade for residential and commercial applications that need reliable, secure remote operation with LiftMaster/Chamberlain Security+ 390 MHz transmitters. The coaxial design supports a remote‑mount antenna connection to help optimize reception when the receiver is installed inside enclosures or near metal surfaces.
Operating on the Security+ rolling‑code platform at 390 MHz, the 412HM is compatible with LiftMaster/Chamberlain Security+ 390 MHz remotes and wireless keypads (typically associated with red/orange Learn button operators). It provides a dry‑contact output that wires to the operator’s push‑button/command terminals and accepts low‑voltage power input (commonly 12–24 VAC/VDC from the operator or an external transformer). Installation is straightforward: mount the receiver, connect power and the relay leads, position the antenna for best reception, then use the onboard Learn button to program transmitters. For best results, route the antenna away from large metal structures and moving parts, and note that this receiver is not intended for Security+ 2.0 (yellow Learn button) systems.
