LiftMaster Residential 24VDC Primary Arm | LIF-LA400DC The New LiftMaster LA400DC primary arm replacement for the LA400PKGUL Swing Gate Operator. Unrivaled performance, safety, and accessibility. Rated for gates up to 16ft. or 850 lbs. Gate Safety and Security Security+ 2.0: Safeguards access to a property with an encrypted signal to virtually eliminate interference and offer an extended range with Security+ 2.0. Safety Reversing: When detecting an obstruction the gate reverses with the inherent reversing sensor and the included monitored safety accessories. Quick Close Feature: With the installation of an optional expansion board, prevent unauthorized access with a quick close feature that stops vehicles from tailgating. UL Listed: Tested to the most stringent UL 325 industry guidelines. Secondary entrapment devices need to be added to meet UL325 standards. Your Installer will recommend suitable secondary entrapment devices for your installation, such as photo eyes or edge sensors.