It was really important to us to have a wall clock that could be seen at night. Digital clocks can be unreliable, garish, and they usually have to be close to you to be read - which means they can easily be knocked off the night stand. They also tend to be harsh on the eyes. This automatically-illuminated wall clock offers the perfect amount of light for viewing at night after our eyes have already adjusted to the dark, and its sensor has just the right amount of sensitivity - such that we can still keep our night-light on on the other side of the room without it triggering the sensor to tell it to shut off the light. And that is not just a normal wall socket night light, it is an actual lamp next to our bed. But in a normal well-lit condition for the room (such as daytime but with the blinds closed), the clock seems to know when to light-up and when not to. It's pretty well-calibrated apparently.It uses C batteries for the light itself, and we've been going a month strong already without any noticeable dimming, so it seems the power consumption must be pretty low as well (including entire days where we keep the overhead lighting off, which allows the clock to light up as well). The design is beautiful and it has added a very classy touch to our living environment. We are grateful that such excellent products still exist at value-oriented price points such as this.