Casio TE-100 - Introduction & Contents; Troubleshooting; User Maintenance and Options; Specifications

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6. Multiple Refunds
1. To refund multiple items you can turn the key to RF mode then
enter the items as you normally would to process a sale.
2. Once the transaction is completed it is important to turn the key
back to REG mode, if it isn’t then the next transaction would be
processed as a refund.