Handmade LED Bead Mask has 6 built-in LEDs. Clear beads are used where LEDs are present so the light shines through. LED Colors: 2 Red, 2 Green, 2 Blue. Choose from 3 different flashing modes; 1st mode is a "strobe", 2nd mode flashes back and forth and 3rd mode is a mix of chasing and mood changing. LED Bead Masks use CR2016 batteries which are included and replaceable. One size fits most.