Strong and reliable chain drive. 5-piece rail system provides faster, easier installation. Security Plus Anti-Burglary Coding sends a brand new code, 1 of over 100-billion every time remote is used. Protector System electronic-eye safety device automatically reverses garage door if anything obstructs it when going down. Breaking the Protector System beam automatically turns garage door opener lights to flash for 5 seconds. Up to 4-1/2 minute time delay. One light lenses. Manual release handle in case of power failure. Includes: Garage door opener, 2 single Security Plus remote controls, multi-function control panel and safety sensors. 100 watts of lighting.