LiftMaster SL3000501U &frac12; HP AC High Traffic Commercial Slide Gate Openers Security+ 2.0TM Patented Multi-Frequency Secure Radio Technology virtually eliminates interference and offers 2X the range of standard remotes so you can access your home quickly and safely. Quick Close/Anti Tailgate Selectable Feature quickly secures gate and prevents unauthorized access. Safety Inputs provided for the addition of safety reversing devices. Each entrapment point should be protected with its own device. LiftMaster has designed its own purpose built P3 motor to meet the exact requirements needed to open and close your gate. Heavy-duty commercial gear driven transmission provides unsurpassed reliability. 1/2 HP Rated for gates up to 37 feet in length and 1,000 lbs.