Neewer Acoustic 5-Band EQ Equalizer Guitar Preamp Piezo Pickup Tuner with LCD Display Tone and volume control. Accurate built-in tuner 5 bands of equalization: Presence, Bass, Middle1, Middle2 and Treble Control Bright and clear illuminated LCD display, easy to read Powered by 6F22 9V battery(INCLUDED) An effective tool to upgrade your acoustic guitar