The LED Coaster l is made of transparent acrylic, and the light transmission is very good. Included two button batteries. The on/off switch in the middle allows you to switch between 3 modes, including flashing (high-speed rotation), steady on and off. The color is red, green, and blue. Great for home parties, New Year’s parties, Christmas, birthdays, receptions, weddings, and various events and gifts. It is also great for home, bar, restaurant, club and other shops. Please wipe with a dry cloth. If it is very dirty, just wet it with water and wipe it gently with a damp cloth. Do not soak or wash in dishwasher.