80 s Style Sound Reactive Light Party Shades are a rad time. Behold the lights as they pulse to the rhythm of the beat at the club the festival and concert. Now get to dancin people. Oh and the best part? There are no lenses so you can wear these at night without any worries! To activate your Sound Reactive Party Shades flip the switch on the bridge of the glasses to the On position. Flip it back to off to rock your shades without the lights on. 80 s Style Sound Reactive Blue Light Party Shades comes ready to use with 3 replaceable AG3 Batteries.