A point-of-sale system for concurrently processing multiple point of sale transactions, each point of sale transaction including an item input portion and a payment portion of the transaction, each portion performed in series. The point-of-sale system comprises a customer facing terminal and a merchant facing terminal. The system can comprise a plurality of customer facing terminals and can be portable. The customer facing terminal is configured to receive an input of payment information for a first point of sale transaction during a payment portion of the first point of sale transaction. The merchant facing terminal is configured to receive an input of an item selection for a second point of sale transaction during an item input portion of the second point of sale transaction and during the payment portion of the first point of sale transaction.