Chamberlain PD610D Power Drive 1/2-HP Chain Drive Garage Access System 1/2 Hp Motor with Industrial-strength, Rugged Chain Drive Protector System Safety Sensors with Rapid-Snap Brackets Quick-Install Rail System Provides Faster and Easier Installation  Assembles in 60 Seconds Delivers 200-Watt of Light with Adjustable Light Time Delay Ten year motor warranty, Two year parts warranty, One year accessory warranty 1/2 Hp Motor with Industrial-strength, Rugged Chain Drive Protector System Safety Sensors with Rapid-Snap Brackets Quick-Install Rail System Provides Faster and Easier Installation Assembles in 60 Seconds Delivers 200-Watt of Light with Adjustable Light Time Delay Ten year motor warranty, Two year parts warranty, One year accessory warranty