The hassle of changing batteries is a thing of the past with Rechargeable Sound Reactive LED Rave Glasses! LED Rave Shades have bright lights that rise and bump with the sound of music. Great for... Parties Clubs & Raves Music Festivals & Concerts To activate your Sound Activated Slotted Glasses, press the button located underneath the left arm and let the music play. Glasses will light up automatically to the music or the sound of your voice. Logo is available.