Specs Bass control: plus/minus 18 dB @ 40 Hz. Mid control: plus/minus 16 dB @ 400Hz or 800 Hz. User selectable frequency center. Treble control: plus/minus 16 dB @ 6.5 KHz. Input impedance: 1 meg ohm Output impedance: 100 ohm 9 or 18 volts operation. Additional 6dB with 18 volts. Distortion: .019 into 10k ohm load Noise: -95 dBm unweighted. Battery life: 324 hours Wire lead length: 6.50 inches Low noise discrete FET input stage, center detent 50 K linear pots, with a dual concentric pot available. Dimensions: 2.5(W)× 1.5(D)× 2.5(H)cm