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Talk to visitors from inside your home with a Cordless Phone System (Sold separately) and the VTech Sn7021 cordless 2-way weather-resistant audio Doorbell. This accessory device gives you added peace of mind at home by allowing you to screen visitors before opening the door. Place the weather-resistant digital doorbell at your front door, The back porch, or any other exterior door around your home. When a visitor presses the button on the two-way doorbell, your amplified cordless phone's handsets and base chime to Let you know someone's there. Then, you can have a conversation through your phone system, without getting up. The VTech Sn7021 cordless 2-way weather-resistant audio Doorbell has changeable chimes and allows you to adjust the volume. It can withstand rain, snow and hot or cold temperatures. Plus, the included batteries offer long battery life and can last up to a year.