The Mighty Mule MM136 Wireless Intercom and Keypad for Automatic Gate Openers is a versatile intercom system that allows for communication between a driver requesting entrance to the property and the person inside of the property. This wireless intercom and keypad allows you to grant access to your property by instructing the visitor to press a button on the keypad at the gate. The intercom provides superior range with two-way communication up to 500 feet wireless. Its rechargeable batteries allow for operation even during power outages. Up to 4 interior base stations can operate off of this convenient intercom for use in different rooms of your house. Mighty Mule Wireless Keypad Intercom | MM136