Aguilar TLC Compressor, Bass Effect Pedal, Trans Linear Control (TLC), Threshold Control: Variable from -30 to -10 dBu, Slope Control: Variable from 2:1 to infinity, Attack Control: Variable from 10 ms to 100 ms, Level Control: Infinity to -3 dBu, Low Distortion: (< 0.2%), Gig-Saver Bypass (signal is looped through even with insufficient battery power), Metal housing, Battery life: > 100 hours, Power supply via 9V battery or 9V power supply (optional #409939#)