Controlled by the push button at the back. Both powered by AC power supply and storage batteries inside after charged. Can be connected to computer to work directly with the USB cable. Not only an eye-protection lighting, but also a distinctive room decoration. Do not use it when charging. The most charge time should be less than 10 hours. Please charge it in time when you use up. Modern and lovely design, giving your children more fun to play it. Not suitable for children under 3 years old. Several colors available (shipped randomly).