Chamberlain Elite HTC Overhead Trolley The Elite HCT Commercial Overhead Trolley Gate Operator is specifically engineered to meet the needs of apartment houses, condominiums and low-clearance installations, the model HCT delivers unsurpassed safety, dependability and quiet operation. In a class by itself, the HCT is a heavy-duty, high-traffic operator designed with many exclusive features, including a Security+® receiver, built-in electronic reversing device, heavy-duty track and keyed trolley assembly The HCT is designed for installation in even the tightest applications. At only 8 inches high, it's up to 10 inches shorter than other overhead operators. In addition, it's extremely quiet so as not to disturb tenants living directly above the garage. For added safety, the HCT includes a key release feature for instant access in case of power failure. And all components are fully enclosed to greatly reduce the risk of injury.