This long flying disc utilizes an ultra bright LED fiber optic array illuminating the entire disc from every angle. The innovative design provides optimal balance and stability. This disc looks, feels, and flies like highest quality non illuminated disc. Longest and straightest flight 185g. Best illumination preserves night vision. Soft and comfortable feel. Water resistant and floats. Long life user replaceable battery. included Red uses 1 CR 2430 battery. Blue and Green use 2 CR 2034 batteries.