Firefly 4 Pcs Night LED Badminton Shuttlecock Birdies Lighting with Colorful Light Changing Dark Night LED Badminton Shuttlecock Birdies Lighting.Delivery within 9-15 business days. LED lights installed in the back of the cork, with On/Off push button. Material: goose feather, feather, SMD lamps, electronic products. Can be lit 20 hours, badminton emphasis than can be used in low-light night. Touch switch lights, IC control. Good durability and excellent performance