1.3-Band3-band equalizer pickup is suitable for many guitars on the market. This pickup equalizer system with 3 bands can be easily installed into your acoustic guitar and is essential for powering up and amplifying your tone. 2.Versatile DesignSupports voice control. Bass, middle and treble control knobs. Built-in tuner. Phase switch. 3.Easy to AssemblePre-wired for easy assembly. Use the pickup immediately with a 9-volt battery (not included), no soldering required. 4.Excellent Musical Instrument AccessoryThis acoustic guitar equalizer is essential to your guitar playing. Really changes the atmosphere and feel of a song or chord. A great accessory for acoustic guitars. 5.Product ServiceIf you have any questions about our products, please feel free to contact us and we will solve it for you as soon as possible. We really appreciate any of your comments, which will help us improve and develop.