The Gigaset A540A Quattro is a set of 4 handsets that fits right into every home. It allows for up to 150 contacts to be stored, enabling you to quickly find the right person. Assign a ringtone and screen color to your most used contacts, so you can see who's calling at a glance. Thanks to caller ID, the caller's telephone number also appears on the screen. Missed a phone call? The answering machine stores up to 20 minutes of messages.