Cordless phones have become a popular household communication tool. Most people don't realize until it's too late that their cordless phone must have power to communicate with the handset. Not being able to make calls during a black-out isn't just inconvenient; it could be the difference between life and death during a real crisis. The KX-TG6821 incorporates a clever Power Failure Talk System; during a black-out you simply place the handset on the base to supply the power stored in your handset to the base unit, then you can make calls even when the power is out. This model also features enhanced anti-blackout features there is no interruption even if you are in mid-call when the power goes out.