Chamberlain LiftMaster CSL24VDC Swing Gate Opener The Chamberlain Liftmaster CSL24VDC is a heavy traffic slide gate opener that has been engineered for than more than a million cycles. The Liftmaster CSW24VDC comes with MyQ technology. This allows you to monitor and control ryour gate from anywhere. It alsoincludes a battery backup system that will work for up to 208 cyces or 24 days. Addionally, Security 2.0 is included on this system.