ITEM NAME:Active 3 Band Guitar EQ Preamp Pickup Piezo For Acoustic Guitar 505R A3H7 Active 3 Band Guitar EQ Preamp Pickup Piezo For Acoustic Guitar 505R A3H7 Under the saddle pickup for acoustic guitar Pre-wired and easy to assemble 3 bands plus volume control Supplied with a battery box This pick-up equalizer system with 3 bands can be easily fitted into your acoustic guitar and it is essential to electrify and amplify their sound. It an actual loudness control so that you can precisely determine the site and get the right sound. This barge is essential for your guitar performance. Connecting wire with 2.5mm plug included Low battery indicator Specification: Bass Control: +/-12dB at 600Hz Middle Control: +/-12dB at 500Hz Treble Control: +/-12dB at 10KHz Power: 9V alkaline battery (EXCLUDED) Equalizer size(L x W): Approx. 1.61 x 3.86 inch/4.1 x 9.8cm Package Includes: 1 x Preamp 1 x Connecting wire with 2.5mm plug 4 x Screws 1 x Mounting base with sticker Note:Light shooting 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.