Acoustic Guitar Pickup, 3-Band EQ with Phase, 2.2 milli-ohm Input Impedance, Frequency Response: 20 Hz – 20 kHz, Bass Control Range: ±12 dB at 70 Hz, Mid Control Range: ±6 dB at 700 Hz, Treble Control Range: ±7 dB at 3 kHz, Battery Life: 700+ hours, Power Supply: 9V Alkaline Battery, Low Battery Check LED, Function: Phase S /W for anti-feedback, B-7500 pickup (piezoceramic), output jack: 6.35 mm (1/4”), dimensions: 74 x 50 mm (2.91” X 1.97”).