Bemodst&reg; 4Pcs Novelty Sports Dark Night LED Glowing Light-up Nylon Badminton Birdies Shuttlecocks 4 pieces of the LED light-up nylon badmintons in one set will be sold together LED light installed in the back of the cork, with an ONOFF push button for easy to use Adopt one LED as light source to give off bright light to allow you to play badmintons Battery use time: about 18 hours Also can act as a common nylon badminton for use when the battery is dying