USB Powered Stationary Combination LED Based Night Sky Projector Simulator with Remote Control Choose from Realistic Looking Colour Changing Nebulas, Moon and Stars at the Touch of a Button The Brightness of Features and the Speed of the Colour Changing Nebula also be Easily Adjusted Choose from Always On, 45 Minute and 90 Minute Session Times for that Perfect Night Mood Light Measures Around 13 cm by 13 cm by 13 cm | Remote Requires 2 x AAA Batteries (Not Included) Projector Powered Via Included USB Cable | Requires 5V|1A USB Power Adaptor (Not Included)