Acoustic Guitar EqualizerGuitar 5 Band Equalizer1.It is used for acoustic guitars that to improve sound.2.Easy to install and use.3.5-band tone controls (under MIDD.1 ...MIDD.2 ..."groupie".PRES)4.Bass control:Positive and negative 12dB5.Medium 1:Positive and negative 12dB6.Medium 2:Positive and negative 12dB7.Triple control:Positive and negative 12dB8 Pres:Positive and negative 12dcolour:blackMaterial:plasticSize:About 98*58mmPackage Contents:1* Guitar Pickup(without battery)1* cable with 2.5mm plug1* mounting base4* screw1* washer1* hex nut1* cable tieOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.