The FireFly® 261 is an enhanced replacement for the popular Firefly® 251 and FF-211. It’s still a two-channel microprocessor-controlled digital lightning simulator, but improved with new features. There’s new audio processing, a more powerful microprocessor, and a new test mode, but with no increase in price. The FF-261 adds Improved audio filters to reduce false “lightning” flashes caused by subsonic or extremely high frequencies not normally heard. Also, a new inductive filter significantly reduces RFI (radio frequency interference). User manuals, audio tracks, and some bonus music tracks are all included on a custom USB flash drive.