This Alarm clock should always be connected to the USB, the battery is only a memory functionWidely Use Kids Alarm Clock is in lovely look and easy to use. It can be used as a wake up light, multi-colored night lights, mood night light, atmosphere lighting,bedroom clocks, interior lighting, wake up clock. 5 LED Light Colors5 SoundNight Light Bedside Clock has The light alarm clock owns 5 Light Colors and 5 sounds adjustment. white, yellow, blue, purple and green.it also have 5 sounds to wake your child up in the morning(bird,3 children's lullabies, dididi soundyou can choose your favourite sounds at the right volume for a gentle wake up call. LED Display 2 Time Modes and 2 Temperature Modes kids Alarm Clock have LED display shows time, date and temperature that are clear to see.There are two time formats, 12 hours and 24 hours, which can be adjusted. There are also two temperature modes:Fahrenheit and Celsius. Kids Friendly MaterialThe Alarm Clock is made of high quality ABS material, it is really safe for your kids. The lovely clock is to be suitable to be a birthday gift or gift for Thanksgiving, Christmas. Children Wake Up Alarm ClockThis is a fun and simple way to tell your child when to get up and go to bed, enticing colored lights and soothing music can help your child fall asleep better.