The Fishman ToneDEQ/AFX is the complete performance solution for the acoustic musician. This is an excellent high quality preamp with dual effects section, tone controls, a compressor, level booster and a balanced DI. It is everything you need. The circuitry is pure analog from end to end of the signal path, from preamp to output for a richer tonal quality. The analog compressor smooths out playing dynamics. The digital effects are mixed in parallel so they don't affect the purity of your acoustic instrument. Variable boost can offer up to 9dB of gain. The fully balanced stage DI has a 1/4 inch amp output and XLR DI for the lowest noise possible. Plus the DI features auto-grounding and pre/post EQ settings. The preamp is a discreet Class A signal conditioning by the leader in instrument preamp design.  The advanced 4 band EQ design provides a wide range of tone control for any acoustic instrument. Variable low cut controls and sub-bass effects. Phase shifter for reducing feedback. Operates for up to 12 hours on a 9v battery (alkaline) or 18 hours (lithium battery). Battery not included. Fishman model 910-R, AC adapter is included at no extra charge. Covered by Fishman warranty.