Small SizeSize: 3.35" x 3.35" x 1.78". Small size fits perfectly as a desk /bedside / nightstand wake up clock . High-quality MaterialsFine finishing hard metal case provides this alarm clock with strong protection.Transparent glass clock surface clearly shows time.Square shape ensures safety when it stands on flat surface. Perfect Home DecorMatte metal case adds incomparable decoration and practicability to your home.Exquisite color and concise design fits any decoration style.Perfect decor for Desk/Bedroom/Bookshelf. Night LightPress the light button on the back, you can light up the clock in the darkness. Small yellow light is friendly to protect your eye. Battery OperatedPowered by 1 "AA" Battery (not included ).The wireless design let it can be placed wherever you need.You can install the alarm clock battery very easily by putting the positive terminal of the battery first and then pushing the negative terminal of the battery down.