Expandable Digital Answering System with one corded and two cordless handsets 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. Power back-up lets you make and receive calls from the base unit even when the power goes out. Range boost technology extends transmission range by up to 20 percent compared to previous generation phones. Talking caller ID conveniently announces caller ID information between rings. Tone equalizer lets you control bass, mid-range and treble tones in a caller's voice for enhanced clarity. Intelligent eco mode is good for your bank account and the environment by lowering power consumption when you use a handset close to the base unit. System provides a large, easy to read LCD screen and is expandable up to six handsets.