You should receive a cash drawer either in the box or separately. It should come in a box like the one below.
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Unbox the case. It will contain 1 Cash drawer, 1 RJ11 telephone jack, 1 set of keys.
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Turn the Cash drawer upside down. Connect the RJ11 Telephone jack into the receipt printer as shown below.
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The cash drawer is now ready to use. Make sure to turn the key position to open, or else Cash Drawer will not open from the Point of Sale.