The VTech VC7151-109 Wireless Home Monitoring System with Cordless Telephone and Garage Door and Open/Closed Sensors is an easy-to-install system with smart home capabilities. With the garage door sensor you can receive alerts on the handsets and base when your garage door is up. The open/closed sensor allows you to keep tabs on areas like doors cabinets and windows and receive an alert when they open or close. In addition to smart home monitoring capabilities the VTech VC7151-109 Wireless Home Monitoring System with Cordless Telephone and Garage Door and Open/Closed Sensors is also a fully-featured telephone with built-in answering system. It features caller ID announce so you can hear whoft. s calling without running to the phone. With up to 22 minutes of recording time and a digital answering system voice set-up guide you can be confident you wonft. t miss a message. This system is expandable up to 5 cordless handsets and 400 sensors.