Turn on the switch on the back of the main unit, and it will flash. (※Pressing it continuously will change the light pattern to 3 different types.) ● I have confirmed that it works, and it lights up at the moment. (Please note that it may light up during shipping.) ● As this is a mass-produced item, please refrain from purchasing if you are concerned about initial scratches, dirt, or initial defects. No returns are accepted to prevent any trouble. Instant purchase is welcome! No discounts.