Presenting cool stylish colorful 3D LED Mug. Mug Glows With Multi Color Lights When Filled With Water Or Any Other Liquid. It is to show the glare of the colorful lights when Raising your hand. glows automatically when drinks are added It turns off when there is no liquid left Perfect for drink competition, see who is the first to finish the drink and turn off all the LED. The Battery of this cup is replaceable. This is best Birthday Gift for your kids , friends & family .