guitar pickup eq guitar preamp equalizer piezo for acoustic guitar eq-505

features: 100% new and unused testing is good under the saddle pickup for acoustic guitar specifications: supplied with a battery box (9v battery not included) connecting wire with 2.5mm plug included low battery indicator dimension: about 40mm*95mm*58mm bass control: ±12db at 600hz middle control: ±12db at 600hz treble control: ±12db at 2.2khz frequency response: 20hz - 20khz sku: gp0908-014 package list: 1 set * pickup