The Profoon PDX-315 DUO provides conversations with a high sound quality. The backlit display clearly shows you whose calling you. The device has an internal contacts storage with room for 50 contacts. You can set up an individual ringtone for your best friend or partner, so you can immediately hear whose calling. If you happen to miss a call, there's no need to worry. The answering machine has room for 15 minutes worth of spoken messages. You can expand your network with up to 5 devices. This way, you can also have a phone in the bedroom or kitchen. The phone runs on 2 rechargeable AAA batteries.