Spark learns your style and feel, then generates authentic bass and drums to accompany you Product Description What is Spark Control A highly requested, wireless and customizable footswitch for the Spark 40 or Spark MINI guitar amps, allowing you to change presets and toggle effects on the fly plus much more. How is Spark Control different from other existing footswitches for Spark Its the only authorized foot controller that’s fully compatible with Spark App, allowing you to control a wide variety of functionalities only available in the app, giving you a more fun and versatile playing experience. What can Spark Control do -Assign/change/toggle presets and effects -Start/stop/pause music, backing tracks or Smart Jam -Activate Tuner and Tap Tempo -Customize your favorite functions to each footswitch -Much more! Is Spark Control powered by a built-in battery What charger/adaptor should I use Yes, Spark Control comes with a built-in battery. Charging via computer is not recommended. How long does the battery last Get more than 4 months of play on a single charge (with 1 hour of average daily use).