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LiftMaster Model 377LM, 377LMC 315MHz Wireless Keyless Entry Owner's Manual. Download Manual. Was this helpful? Yes No. Recommended Articles. These instructions cover the Liftmaster 377LM Wireless Keyless Entry Access your garage and home without the use of a key or a remote control. Models 377LM, 377LMC. 315 MHz Security✚® Side two contains instructions for installing the Keyless Replace keypad and complete installation with. View and Download Chamberlain LiftMaster Security+ 377LM owner's manual online. Chamberlain 315 MHz Security Wireless Keyless Entry Owner's Manual. Replace keypad and complete installation with bottom screw, using care to avoid cracking plastic housing. Do not overtighten. Reinstall battery and replace the