This board is required when your booths does NOT have a UBC and you are using a Mars bill acceptor. This board "slows down" the pulses from the bill acceptor so our system can read them. Without this board your customers will only get partial credit. For example if they deposit a $5 bill, they may only get $4.25 worth of credit. This board fits "in line" with your existing phone cord. Additional phone cord is included with this board.