FireFly® 351 Digital Lightning Simulator with 4 ProLight™ 400s and a microwave motion sensor. The best lightning simulator is now available complete with lights at a special price! Run a continuous loop thunder-and-lightning effect, or use the motion sensor to trigger thunder and lightning on demand, even through fog and haze! Add a pair of powered speakers for a turnkey system! User manuals, audio tracks, and some bonus music tracks are all included on a custom USB flash drive.