You can press the round button on the top of battery box, when press 1st time the light turn on, press from 1st time to 7th time the light will change one color each time, black widow costumes when press 8th time the colors will automatically Loop all 7 colors and so anime halloween costumes on. 2. Turn on the LED mask when you received and light up until all power gone. We recommend that a child be 12 years of age or older to use this product.