1/2 HP motor with industrial-strength, rugged chain drive. Delivers 100 watts of light with adjustable light time delay. The protector system safety sensors with rapid-snap brackets project an invisible light beam across the garage door opening and automatically reverse the door if anything interrupts the beam while the door is going down.
| | Chamberlain 1/2-HP Power Drive Chain Garage Door Opener PD210D |  | 138.0 |  |
 | Chamberlain Garage Door Opener (PD210D) |  | 149.99 | |
 | Chamberlain Power Drive 1/2 HP Chain Drive Garage Door Opener Access System PD210D |  | 118.0 | |
 | Power Drive 1/2 HP Chain Drive Garage Access System - Garage Doors & Openers |  | 142.62 | |