CONTROL MODE - Sound control/self-propelled mode is controllable, it will automatically synchronize with your music or any sound source (even your voice) to control the flashing of the lights.^ PRODUCT - 108 white LEDs, Ultra-high brightness, metal shell with good heat dissipation, long service life (up to 50,000 hours).^ USES - Bars, parties, Christmas, KTV discos, weddings, DJ/band/stage performances, clubs, discos, small private parties, family celebrations, friends gatherings and birthday parties, etc.^ VARIABLE SPEED CONTROL - Turn on the red switch to activate the sound control/automatic mode switch; turn the blue knob: you can adjust the sensitivity of the light to the music flicker, so that the speed of Stage Lights can be controlled from slow to fast.^ WARNING - Please don't let your eyes for a long time looking at strobe light, because the light is very bright, it will make the eyes feel uncomfortable.^