Motorola SD4591 Digital Corded/Cordless System Phone with Answering Machine and Keypad in Base, SD4500 Series Add up to 8 cordless devices per base, with no additional phone jack required Corded/cordless combination lets you choose the most convenient option for each conversation Caller ID with visual call waiting lets you see incoming caller's name and number before you answer 15 different melody ring tones can be personalized to identify incoming callers Hands-free intercom lets you communicate between rooms in your home