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3873 reader micro sd products are offered for sale by suppliers on Alibaba.com, of which card readers accounts for 34%, memory cards accounts for 5%, and access control card readers accounts for 1%. A wide variety of reader micro sd options are available to you, such as type, usb 2.0 and usb 3.0.You can also choose from abs, plastic and aluminum reader micro sd,As well as from all in 1 / multi in 1, single reader micro sd,and whether reader micro sd is external, or internal.