Vtech CS6829-2 2 Handset Answering System with Caller ID/Call Waiting (Certified Refurbished) ECO mode power-conserving technology. Power-conserving technology manages consumption for optimal battery performance. Caller ID/call waitingstores 50 calls. Handset displays the name, number, time and date of incoming calls. Full duplex handset speakerphone The entire keypad illuminates along with the LCD screen, allowing for easier viewing in dim light.