Chamberlain WD832KEV Garage Door Opener, &frac12; HP, Ultra-Quiet Belt Drive Operation, MyQ Smartphone Control Enabled (Internet Gateway Sold Separately), Includes 2-3 Button Remotes, Keyless Entry Keypad, Multi-Function Wall Control Panel Ultra-quiet & strong 1/2hp belt drive garage door opener features steel-reinforced belt drive and Chamberlains Motor Vibration isolation System to eliminate powerhead vibration for reduced noise. MyQ enabled technology allows you to use your smartphone to monitor and control your garage door opener. (MyQ Internet Gateway CIGBU required and sold separately). The timer-to-close feature automatically close the garage door if you forget, and it can be set for one, five, or 10 minutes. 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. Quick-install rail system provides faster and easier installation: assembles in 60 seconds, home link compatible - compatible bridge (not included) necessary for certain vehicles. Visit bridge.Chamberlain.Com to find out if a bridge is needed.