The LiftMaster 850LM Universal Receiver is designed for gated communities, commercial buildings, and other access control applications that require reliable multi-user operation. Featuring Security+ 2.0® technology, it provides secure communication with compatible LiftMaster remote controls. The receiver includes three channels for expanded capacity, supporting up to 50 remotes on Channel 1 and up to 20 remotes each on Channels 2 and 3. Its compact design fits most gate and commercial door operators, and it can operate on either 12–24VDC or 12–24VAC power.