Panasonic KX TG6645B features DECT plus technology takes the superb sound quality and outstanding range of DECT 6.0 phones to a level. By increasing the frequency of error correction, the transmission quality is improved and the phone's range is extended. Engineered to work in 1.9 GHz frequency, their DECT 6.0 phones won't conflict with common wireless devices such as 2.4 GHz routers, wireless keyboards and mice, microwave ovens and other household items. And because it's digital, you'll enjoy long range and clear sound while deterring eavesdropping. What happens to your phone when there's a power outage? Nothing, with their power back-up operation, a powerful battery back-up system keeps you connected so when the power goes out. Keep a charged handset in the base unit and you can still make and receive calls with the other cordless handsets. Now you don't have to be holding the phone to see whose calling, using text-to-speech technology, the Caller ID information is announced in between rings! The phone also boasts an alarm clock that speaks to you, as in "It's time for lunch" and the phone politely tells you when your battery is low with a "Please charge phone" reminder! Panasonic KX TG6645B features automatically lower the power consumption when you're using the handset close to the base unit. Not only does it extend the available talk time, it's good for the environment. When less power is used by the handset to communicate with the base unit, battery life is prolonged which results in less frequent charging and can result in fewer batteries in landfills.