Acoustic Guitar Pickup, 5-Band EQ with Phase, 2.2 milli-ohm Input Impedance, Frequency Response: 20 Hz – 20 kHz, Bass Control Range: ±15 dB at 100 Hz, Low Mid Control Range : ±10 dB at 300 Hz, Mid Hi Control Range: ±12 dB at 800 Hz, High Control Range: ±12 dB at 3 kHz, Presence Control Range: ±9 dB at 15 kHz, battery: more than 700 hours, power supply: 9V alkaline battery, low battery check LED, function: Phase S/W for anti-feedback, pickup B-7500 (piezo ceramic), output jack: 6.35 mm (1/4”), dimensions: 73 x 53 mm (2.87” X 2.09”).