The MM136 wireless intercom/keypad is a versatile intercom system that allows for communication between a driver requesting entrance to the property and a person inside of the property. The MM136 allows you to grant access to your property by instructing the visitor to press a button on the keypad at the gate. The system is ideal for any residential application and it alerts you to the identity of visitors from the safety of your home. The intercom provides superior range with two-way communication up to 500 ft wireless. It comes with outdoor call/keypad unit that can be programmed with up to 25 entry codes for keypad access. The MM136 also comes with an indoor base unit that is mobile and can be used anywhere in your home just like a cordless phone. Rechargeable batteries allow for operation even during power outages. Up to 4 interior base stations can operate off of the Intercom (MM136B) for use in different rooms of your house.