MINGS MG-20 Preamp 3 Band EQ with LCD Tuner Piezo Pickup for Acoucstic Guitar

Nominal Input Level: -20dBV
Input Impedance:  >1M Ohm
Output Impedance:  <2K Ohm (20Hz~20KHz)
Nominal Output Level: -12dBV
Volume control  
3 Band EQ: Bass,Middle,Treble
Anti-feedback control (Notch)
Phase switch
Chromatic tuner with LCD display   
Low battery indicator 
Dimensions: 75mm (W) X 56mm(H)