Features:Perfect for most acoustic guitars, presenting the sound of the guitar perfectly.The pickup produces clean sound quality and has low feedback.This 4-band Equalizer system is essential for all players who are looking to improve acoustic guitar sound.Built-in chromatic tuner with high-definition LCD lets you adjust the tone easily and provides precise tuning.This mini EQ is small, it can be easily built into a guitar although of course some cut, drilling and other changes that would be needed.Specification:Condition: 100% brand newFunction: 4 band EQInput impedance: 10MFrequency response: 20 HZ-20 KHZControlRange:Low: +/-12 dB to 60 HZmedium: +/-12 dB to 500 HZTreble: +/-12 dB to 3 KHZBrill: +/-12 dB to 10 KHZFeatures: LCD TUNER SystemBattery: 9V Alkaline battery (NOT included)Dimension: 85 * 43 * 42mm / 3.3 * 1.7 * 1.7in Package List:1 x Pickup1 x Cable1 x Installation Package