Know who's calling with caller ID/call waiting. The VTech CS6649 Handset displays the name, number, time and date of incoming calls. Leave your hands free, or bring more people into the conversation: The speakerphones allow you to talk and listen without holding the handset. 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. Silence the ringer on the handset and base unit immediately, or for an extended period of time. 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.