Features: 3-band preamp EQ equalizer, Features accurate tuning, backlight LCD display, battery indicator light Rotate to adjust frequency(bass, middle, treble) and volume level, very convenient. Connect with external speaker and audio inputs, press to control playing music from memory card or USB disk. Lightweight, compact 3-band equalizer, well fitted into the acoustic guitar, allows easy tweaking controls, for better performance. Package include: 1 x EQ equalizer, 1 x piezo pickup rod, 1 x battery box, 1 x battery, 10 x mounting screws, 1 x plastic base, 1 x cable tie. Specifications: Material: Plastic + Electronic Components Color: Black Bass: +/-12dB at 75Hz Middle: +/-12dB at 750Hz Treble: +/-12dB at 10KHz Tuning Range: 0A(27.5Hz)-8C(4186.01Hz) A4 Frequency: 440Hz Memory Card Slot: Yes USB Port: Yes Power Supply: 1 * 6F22 9V Battery Product Dimension: 79*49*26mm / 3.11*1.92*1.02in Net Weight: 95g / 3.35oz Package Size: 10.5*7*7cm / 4.13*2.75*2.75in Package Weight: 160g / 5.64oz Note: 3 band EQ equalizer set only, other accessories in the pictures are not included. Please read the user manual carefully for more information, before usage. Due to lighting or other reasons, the picture and material object may slightly differ. Due to manual measurement, there may be deviation, please in kind prevail. Packing List: 1 * 3 Band EQ Equalizer 1 * Pick-up Rod 1 * Plastic Base 1 * Cable Tie 10 * Screw 1 * 6F22 9V Battery 1 * User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin