From Dr. Scientist:BoostBotThe BoostBot is an always-on, ultra-compact clean boost with dynamic, real-time level display meter. The boost circuit is a classic op amp design, a clean and loud amplifier that sounds great and provides 20dB of boost. Displaying the signal level is a classic 10 Segment Bar Graph LED. Like all Dr. Scientist pedals the BoostBot can be used with guitar, bass, synths, and many other instruments.Features 20dB of clean boost Bright Bar Graph LED to display your signal level Illuminated volume control Ultra-compact design Available in several different colours High quality analog signal path Premium parts and components throughout Designed and handmade in B.C., Canada Knobs Volume– Sets the amount of boost, unity gain buffer when at minimum, 20dB of gain when at maximumOperation 1MΩ input impedance, 1kΩ output impedance 75mA @ 9VDC, 150mA @ 18VDC, 2.1mm centre negative The BoostBot is always on Additional Specs Mono input, mono output Dimensions: 73mm wide, 51mm long, 42mm tall (2.9” wide, 2.0” long, 1.7” tall)