This pick-up equalizer system with 4 bands can be easily fitted into your acoustic guitar and it is essential to accurate tuning even in noisy rooms Product Description: Under the saddle pickup for acoustic guitar Pre-wired for easy assembly Tone and volume control 4 bands With volume, bass, mid., treble, pres control knobs Supplied with a battery box Low battery indicator Easy to read metronome on LCD display Specifications: Presence Control: ¡À12dB at 8KHz Bass Control: ¡À12dB at 600Hz Middle Control: ¡À12dB at 600Hz Treble Control: ¡À12dB at 2.2KHz Input Impedance: 10M¦Ø Frequency Response: 20Hz - 20KHz Power: 9V alkaline battery (included) Package Included: 1 x Pre-amp 1 x Pickup with battery box 1 x Connecting wire with 2.5mm plug 1 x 9 Volt battery 1 x Mounting base with sticker 8 x Mounting screws