Vktech Professional 4-Band Acoustic EQ Guitar Preamp Equalizer Pickup LCD Tuner With this preamp, you spend less time tweaking controls and more time playing Instead of just an switch, the tone shaper features an actual loudness contour control so that you can precisely determine the level of the contour and get the right sound 4-band tone controls (BASS, MIDD, TREBLE, PRESENCE) for all guitarists looking to improve their sound LCD Tuner system Chromatic and Guitar or Bass tuning modes Pickup size: Approx. 9.8 x 5.8 x 4.0cm/ 3.9 x 2.3x 1.6in (L*W*H)