I am selling this preamp because I preferred another one I purchased. I only used it indoors, at home. There is no Velcro on the back. The box and instruction manual are included. The BB-1X is a bass effects unit that offers a wide variety of tones. - Model Name: BB-1X - Output Terminals: OUTPUT, LINE OUT - Balanced Output: BALANCED OUT - Color: Blue - Input Terminals: INPUT Thank you for looking.