Two-line Expandable Digital Answering System with one corded and one cordless handset takes the superb sound quality and outstanding range of DECT 6.0 phones to a new level by increasing up to 80 times the frequency of error correction. Engineered to work in 1.9GHz frequency, phones won't conflict with common wireless devices. Easily connect your phones to your PC via USB and make calls directly from your Outlook contact list. Two-line operation lets you conference on two outside lines for a three-way conversation or place a current call on hold to make another call. Large font size on large angle-adjustable LCD on base unit makes caller ID information crisp and clear. Program each handset to ring or not ring at your discretion. Power back-up lets you make and receive calls from the base unit even when the power goes out. System is expandable up to six handsets.