This travel alarm clock is so small that you can hold it in your hand easily. The square clock doesn't take up any extra space. You just need to leave a little space in your backpack to carry it. There are only two setting wheels on the back, time and alarm, which is a convenient classic design, turn the wheel to adjust the time and the alarm, and the light button is placed on the front of the alarm clock. Alarm on/off switch is located on top of the small analog clock where it is easy to reach. Lifting is open and pressing is closed. It’s easy to tell if the alarm is on or off. This small clock runs on 1 AA battery (not included). No disturbing ticking sounds since the clock has a silent quartz movement. This alarm clock will allow you to have a quiet sleep environment. This analog alarm clock is made of ABS + PVC material which is durable.