Litecubes are activated by a small push button and can be set for a steady glow, or two levels of flashing: fast or slow. They are FDA approved and completely safe to put into any type of beverage. The are encased in a waterproof non toxic shell and packed with coolant gel to keep your favorite beverage frosty. Freeze them and use them over and over again. Litecubes are quality products and do not look or feel cheap. They will provide many hours of fun and entertainment when used properly.