Thank you for viewing. This product is designed to draw power from a landline, allowing it to be used even during a power outage. I purchased it to have on hand for use in the event of a disaster. I am now selling it because I have canceled my landline service and no longer need it. I think it's easy to use with its simple features. Features: Usable during power outages (when using an NTT landline) No power required Ringtone selection: 3 types Ringtone volume adjustment: 3 levels + OFF Speed dial: 10 numbers Redial function: 1 number Incoming call lamp Receiver volume adjustment Microphone mute function No claims and no returns accepted. Returns and refunds are not accepted.