I am selling 6 brand new aura interactor backpacks. Each backpack contains a bass shaker and an amplifier. The bass shakers are in in the backpacks and all that has to be done is to unscrew/disassemble the backpacks to extract the bass shakers and the amplifiers. The bass shakers usually sell for about $45 for a pair and it doesn't even an include an amplifier. I am selling all 6 bass shakers and amplifiers for $35 plus shipping.