If you have never played frisbee at night you are really missing out. This LED glow frisbee runs for 30 hours on 1 set of batteries, floats, is very durable & is the best glow frisbee we have seen at this price. Each frisbee runs on 2 CR2016 batteries which are widely available & cheap to replace, but you won't be doing that much as the set included will last up to a staggering 30 hours of constant use! An absolutely fantastic product that will give you lots of fun Colour changing frisbee 30 hour battery life Batteries included (2 x CR2016) Durable Floats Water resistant 25cm diameter 130g Very bright Loads of fun! We guarantee you will love this! The must have summer product.