The Royal MB30 Cash Drawer with USB has 5 Bill Slots that are sized to accommodate US Canadian or Mexican paper currency. The removable coin slot has 8 coin slots that can be adjusted to size. You can connect your cash drawer to a POS register or computer with the USB. You can use RJ11 or USB interface. 3 Position key lock - Closed automatic open or manual open. The drawer can open when an electronic pulse is received from the POS printer. Fully compatible with other brands.