The Firefly Guitar Pick: Create an LED Light Show Timed to Your Music — Video
"The Firefly Pick allows you to create an LED light show timed to your music. Motion-triggered LED pulses track guitar pick action to add a brilliant visual effect intimately connected to the guitarist's rhythm. The Firefly Pick is the same shape as a normal guitar pick and features a beveled tip optimized by pros, allowing musicians to experience and deliver this brilliant visual effect without compromising the playability or music."