Waking up early most mornings is not an option for me. If I oversleep, it means missing a plane or a speaking commitment or radio broadcasts or an important meeting. In other words, my clock radio had better work. And it does. Even on the days when many other clock radios don't. Because the power went out during the night, that is. There have been mornings when I have been awakened by my clock radio - and looked over at the other one in the room and seen it blinking at me some time when it was the middle of the night. Now, that clock was plugged into the wall - and sometime during the night the external power supply had failed. Good thing I wasn't depending on that! But mine always comes through - because it's powered by batteries! What keeps it going is inside!