Read the manual, it will tell you. Try these links for some help.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0CDEQFjAD&url=http%3A%2F%2Fwww.manualsprinter.com%2Fmanuals%2Fdell%2FDELL_1320c.pdf&ei=jtv0VJWSO8TxUq3mg6gK&usg=AFQjCNFT7WybaqBHaHdg8PII94AdLsIhcg&bvm=bv.87269000,d.d2
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