The Motorola S3001's address book offers space for 100 contacts. This landline phone can also store up to 50 missed calls, making it easy to return those calls. When you receive a call, you'll immediately see who's calling thanks to caller ID. The adjustable volume and the extra-loud ringtone ensure you'll never miss a call again. Want to be reachable in multiple rooms? No problem. You can expand this set to a total of no less than 5 handsets.