CAUTION: Halloween fun ahead! Perfect for all your haunted house needs, or for good times at your non-haunted home or at events! These mini strobe lights are awesome for creating amazing party effects like in the best bars and clubs, or the most terrifying scary effects like in amusement parks and movies! These are small, featuring 3 lighting tubes, and meant for home and recreational use. They fit the colored screens, but do not include them. You can adjust the blinking speed, and mount to walls and ceilings. No batteries required, just plug into any wall socket (North American) and turn on/off with switch on cord!