Liftmaster 850LM 811LMX 310MHz 315MHz 390MHz Gate Door Opener Universal Receiver
Compatible with 811LM, 813LM, and all MAX remote controls
Frequency 310 MHz, 315 MHz, and 390 MHz Security+ 2.0
Capable of Channel 1: 50 Remote, Channel 2: 20 Remotes, Channel 3: 20 Remotes
Includes 1 pieces of 811LMX