Feature:1. MULTIPLE FUNCTION: Analog acoustic preamplifier effect pedal with digital effects and loop function, with strong practicality.2. EASY ADJUSTMENT: With reverb and chorus effects, each effect is controlled by only one knob, which is easy to adjust.3. SIGNAL PROCESSING: Can optimize the preamp input according to guitar pickup type, and can set piezoelectric or magnetic to better process the signal.4. 3 BAND EQ: With 3 band equalizer control (bass, middle and treble), and has 60 second loop, frequency response range is 20Hz20KHz.5. WITH TOGGLE SWITCH: Notch filter toggle switch with precise adjustment control, with USB interface and XLR DI output.Specification:Item Type: Acoustic Preamp EffectMaterial: MetalColor: YellowSampling Rate: 44.1KHzSignal Processing Operation: 32BitFrequency Response: 20Hz-20KHz 1dBDynamic Range: 120dBMaximum Input: +10dBMaximum Output: +10dBProduct Power Supply: DC9V (not included)Normal Current: 180mA positive outside and negative insideEQ Control: High frequency 10dB at 15kHzIntermediate frequency 10dB at 1.8kHzLow frequency 10dB at 80Hz.Package List:1 x Effect1 x User Manual