Our LED bracelet is made of silicone with 2 LEDs. It can glows for 50 hours with 2 bulit-in batteries. Choose from 3 styles: Voice control, Shake control and Button control. And the button control style has 3 different light settings: fast flash, slow flash and steady on. Assorted light colors are available. Custom logo can be printed. Two sizes are available: Large size: 4/5''W x 3''D; Small size: 4/5''W x 2 1/6''D