Schertler's "onboard" acoustic guitar preamplifier is based on the standard BLUESTiCK and includes all the features necessary for producing great sound: Volume, treble and bass controls, notch filter with bass control, battery check and an innovative three-stage gain structure. Plus, thanks to its compact size and ease of installation, Onboard is right for any guitarist seeking a variety of tone configurations adjustable at the guitar. Sound quality and long battery life (approx. 200 hours), combined with extremely quiet operation, are ensured by class A (constant current) circuitry. Schertler's "onboard" is suitable for all BLUESTICK types.