Most importantly, you cannot unset the alarm. You can change the time, but you can not remove the alarm altogether. In fact, my device goes off at a number of different times. I know not why. This is a simple device. You wouldn't expect to need to read directions, but, as I wanted the damned alarm to stop, I did. Of course, the directions are poorly translated from another language.
Aside from this, the clock is pretty neat for what you pay for. The numbers are large and easy to read. It also features a fun multi-color lighting affect. It's great for kids. ...kids that can never sleep in, even over the weekend. The clock & alarm will operate just fine w/the two small batteries it comes with. If you want the cool lighting affect, you'll need two triple-a batteries. Unfortunately, the setting buttons are on the bottom, they're tiny, difficult to press & are the same color as the unit, so it's difficult to see/set.
The cool lighting and big numbers matter not when I must remove the batteries or remove from my room altogether, just to sleep in over the weekend. This is not a cost issue. This is poorly designed. RIDICULOUS.