This is not a phone system. It is an additional or extra handset for an existing system. Add up to 5 handsets to the Panasonic KX-TGM420W Amplified Phone base. Have multiple phones throughout your home at a fraction of the cost! Add up to 5 handsets to the Panasonic KX-TGM420W Amplified Phone base. These expansion handsets share all of the same features as the base phone. They come with their own charging dock, making them convenient to place in many rooms. What is needed to make this item work? Panasonic KX-TGM420W Amplified Phone Warranty One year warranty Brand Panasonic Product Type Telephone Returns: Returns requests are accepted within 30 days of the date of purchase through Returns. Returned item(s) must be the item(s) purchased and must be returned complete in new resalable condition with nothing missing.