Silent electronic alarm clock led multifunctional fluorescent luminous board clock innotime birthday gift

Colorful light alarm message board, background light (blue / Green / white optional), A, B two kinds of styles by your optional, two can be used alone in the battery, battery alone, background light is not lit, press the alarm lights, after 30 seconds out; can also link power supply use this background light. B comes with a USB interface power supply line and four USB interface converter, pro can be selected according to your needs!