Synchrony™ Firefly listens to music using the built-in microphone. Powered by an advanced neural network that synchronizes oscillations to music, it finds the beat of any music in real time. Synchrony™ tells you the tempo as it listens. Its great for finding the tempo of live or recorded music, and for practicing keeping a steady beat. It can also flash the screen or the flashlight to the beat, like a firefly. Fun for concerts and for dance parties.