I purchased this 6-band equalizer used last year. I liked its compact size, but I'm selling it because I've upgraded to a 10-band EQ. There's no crackling, and it functions well. Please check the images for any exterior scratches. This is an effects pedal that allows you to adjust the sound quality with a 6-band EQ. - Brand: MXR - Model Name: six band eq - Number of Bands: 6 - Frequency Bands: 100, 200, 400, 800, 1.6K, 3.2K - Adjustment Range: -18dB - Input/Output Terminals: 1/4 inch jack - Switch Type: True Bypass - Color: Silver Thank you for looking.