The Linear LDCO801 is an energy-efficient, DC-powered Garage Door Operator with ultra-smooth, quiet performance, thanks to its variable speed motor. It features a 100-watt courtesy light (bulb not included). Optional Battery Backup (BBU) is available for added peace of mind. Its self-diagnostic system continually checks for proper operation. The MegaCode® radio system with over a million unique codes and configurable access levels for up to 10 users ensure added security and versatility.