5 Bands Acoustic Guitar Preamp EQ Tuner Piezo Prener LC-5 100% brand new and unused Presence Control: 12dB at 8KHz ,Bass Control: 12dB at 600Hz ,Middle1 Control: 12dB at 600Hz ,Middle2 Control: 12dB at 600Hz ,Treble Control: 12dB at 2.2KHz Input Impedance: 10M ,Frequency Response: 20Hz - 20KHz , Power: 9V alkaline battery(battery not included) The Prener LC-5 pick-up equalizer system with 5 bands can be easily fitted into your acoustic guitar and it is essential to electrify and amplify their sound.