A cash drawer plugs into your receipt printer. The drawer will pop open after a sale is completed and the receipt starts printing. We recommend these devices from Star Micronics:
CD3-1313 Value Cash Drawer
Windows, Mac, and iPad
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Star SMD2-1317
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Star SMD2-1617
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Star CD3-1313
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Star CD3-1616
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Star CD4-1416
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Star CD4-1616
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ECD410-B
Cash Drawer RT-E330