Skylink MF-1 Universal Garage Door Opener 3-Button Remote Control Transmitter Kit Easy to install and compatible with ANY garage door opener brand. Simply install the receiver over your garage door wall button/console with just two screws. Optional passcode protection feature enables you to enter a passcode before using just like your smartphone to prevent break-ins to your home if your remote is lost or stolen. The passcode feature also saves you from accidental opening/closing your garage door. Expandable, add up to 16 remote controls (model: LK-318) to the smart control receiver. Smart Control Receiver is operated by two low cost AA Alkaline battery (Not included). The Smart Control Receiver can be also be powered with an AC Adapter (Optional).