Chamberlain garage door opener features a 0. 5-HP motor with an industrial-strength chain drive system for durable reliable performance. Safety features include Security 2. 0 rolling code technology and PosiLock anti-theft protection ensuring the garage door stays locked once it closes. Accessories include 1 pre-programmed 3-button multi-frequency remote for consistent performance over a long range easy push-button wall control and safety sensors. Light illuminates garage with 100-watt bulb for increased safety and security bulb sold separately.