Expandable up to 5 handsets with only one phone jack-accessory handsets (sold separately). Additional handsets can be placed anywhere in your home or office near an outlet, no phone jack necessary. Convenient, flexible and easy to use. Know who's calling with caller ID/call waiting. Handset displays the name, number, time and date of incoming calls.The entire keypad illuminates along with the LCD screen, allowing for easier viewing in dim light. Power-conserving technology manages consumption for optimal battery performance.