USB cash drawers are not commonly used. The most common type of cash drawer is a receipt printer driven; the cash drawer is connected to and opened by the receipt printer. A USB cash drawer is a good choice if a standard 3" receipt printer is not present. For example, many businesses print receipts on full 8”x11” carbon copy receipts. Any business that does not use the standard 3” receipt printer, a USB cash drawer is the way to go. However, a USB cash drawer usually operates as a virtual serial (RS232) device, so it is best to always check with your POS software vendor first before purchasing a USB operated cash drawer.