Acoustic Guitar Equalizer Guitar 5 Band Equalizer 1.It is used for acoustic guitars that seek to improve sound. 2.Easy to install and use. 3.5-band tone controls (under MIDD.1 ...MIDD.2 ..."groupie".PRES) 4. control:Positive and negative 12dB 5.Medium 1:Positive and negative 12dB 6.Medium 2:Positive and negative 12dB 7.Triple control:Positive and negative 12dB 8 Pres:Positive and negative 12d colour:black Material:plastic Size:About 98*58mm Package Contents: 1* Guitar Pickup(without battery) 1* cable with 2.5mm plug 1* mounting base 4* screw 1* washer 1* hex nut 1* cable tie Only the above package content, other products are not included. Note: Light 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.