I like this clock because it has large digits that are easy to read in the dark, even when I am not quite awake. I can adjust the brightness of the light to my own preference or turn it off completely. This clock operates with the included USB power cord but the charging block that plugs into a wall outlet is not included. It also uses 4 AAA batteries (not included) to keep track of the time during a power outage due to storm or when you unplug the clock to move it to a different outlet. When the power comes back on, the clock shows the correct time. No need to fumble with setting the time. We live in a very rural area and experience frequent power outages so this gives up peace of mind that our alarm will still go off on time. I like that this clock also has 2 USB ports so I can use it to charge my phone and my tablet using just one wall outlet plug.