With MVP LED diodes you can make your disc light up so you can easily find it if you have to play when it's dark. The diodes can be placed both on the underside or on the top of your disc, depending on your preference and whether you play with a transparent plastic disc. It is recommended that the diodes be mounted with clear tape (not included).
When the diode is switched on, it has three different settings so you can make it light up in different ways by pressing on and off. The diodes are switched on by squeezing the diode at the opposite end of where the small battery sits.
The diodes are very light and have minimal impact on your disc's flight characteristics. The diodes sell individually.