This is Peavey EQ Q231FX Dual 31-Band 1/3 Octave Equalizer FLS X 231 FEEDBACK DETECTION in good working condition.  Features 2 channels of FLS feedback locating system and an AC power adapter.

See pictures.

Specifications:

Frequency Response: +/-1 dB, 20 Hz to 20 kHz

Distortion: 0.005%, 20 Hz to 20 kHz

Input Impedance: Balanced 20K ohms (equal impedances to ground)

Output Impedance: 330 ohms

Maximum Input Level: +21 dBV (8 V RMS)

Maximum Output Level: +21 dBV (8 V RMS)

Nominal Input Level: 0 dBV (1 V RMS)

Nominal Output Level: 0 dBV (1 V RMS)

Input Headroom: Nominal 21 dB

Output Headroom: 21 dB

Output Noise:
-EQ in bypass: -101 dBV
-EQ in filter: -95 dBV

Filter Frequencies: 20 Hz, 25 Hz, 32 Hz, 40 Hz, 50 Hz, 63 Hz, 80 Hz, 100 
Hz, 125 Hz, 160 Hz, 200 Hz, 250 Hz, 315 Hz, 400 Hz, 500 Hz, 630 Hz, 800 Hz, 1 
kHz, 1.25 kHz, 1.6 kHz, 2 kHz, 2.5 kHz, 3.15 kHz, 4 kHz, 5 kHz, 6.3 kHz, 8 kHz, 
10 kHz, 12.5 kHz, 16 kHz, and 20 kHz 

Filter Q: 4.77

Maximum Boost and Cut Filter: +12 dB, -18 dB

Maximum Boost and Cut Gain: +/-15 dB

Low Cut Filter: 40 Hz

Power Consumption: 120 V AC, 60 Hz, 20 watts

Dimensions (H x W x D): 5.25 H x 19 W x 10.75 D in.