Safty DesignSafe ABS material, the alarm clock has a child safety lock function to prevent children from accidentally destroying the set functions. This child alarm clock needs to be plugged into the attached USB power cord to use it. Toddler Sleep Trainer A child sleep trainer with a cute appearance, designed for children, allows children to distinguish when it is time to go to bed and when to get up, so that children can develop good sleeping habits and help parents get more sleep time. Nap Timer & Snooze Function for Extra Sleep Nap timer settings available. Snooze function provides extra sleep time to get completely refreshed before get up. Different Color & BrightnessCan be used as a night light. The night light of this alarm clock has 5 different colors, which can assist the child's sleep. In addition, it has a temperature display function, and the backlight has four levels of brightness that can be adjusted. Sleep Sound Machine with LED Nightlights3 kinds of auxiliary sleep music, 5 kinds of alarm wake-up music, 3 levels of volume can be adjusted to meet different needs.