This must be added to your existing systemThe BT4000 and 4500 Additional Handset Big Button Phone is a cordless phone designed for ease of use, with large buttons for clear dialling. Made by the brand Big Button, this handset offers convenience and practicality for home or office use. With the option to add additional handsets, this phone system allows for multiple users to communicate efficiently within the same network. Perfect for those looking for a simple and reliable phone with a focus on user-friendly design.
eBay