Projection function: The astronaut projector star lamp has a projection function, which can project beautiful stars on the ceiling and walls, which is colorful and full of fun. Built-in battery: The astronaut star projector has a built-in 1200mAh battery, which does not need to be charged when in use, and can be moved freely without a cable tie. Replaceable slide film: The projection lamp film can be quickly installed in just four steps. Unscrew the soft cover first, then peel off the film to replace the new one, which is convenient to use and does not waste time. USB charging: The astronaut star projector lamp can be charged via USB, but please note that it is powered by 5V 1A. Please do not use a larger power adapter than this for charging. Music function: The astronaut projector star lamp has a music function. You can project beautiful stars while playing music to show a romantic feeling.