Accessory handset only-requires a EL52265, or EL52365 to operate Caller ID/call waiting-30 name and number caller ID history Handset displays the name, number, time, and date of incoming calls. Simulated full-duplex handset speakerphone Enjoy a speakerphone that can keep up with your calls. Increase participation by allowing both ends to speak-and be heard-at the same time for conversations that are more true to life. Extra-large display for easy viewing High-contrast black text on the extra-large screen makes it easy to read incoming caller ID or call history records. Plus, the lighted handset keypad allows for easy dialing in low-light conditions. ECO mode power-conserving technologyECO mode manages power consumption so the system uses less energy and you get the best battery life.