The D3100 works with the MC-DC2 remote release cord. You can get one from your Nikon dealer or direct from Nikon at
http://shop.nikonusa.com/store/nikonusa/en_US/pd/productID.213506400
A third-party equivalent is available at
http://www.overstock.com/Electronics/Remote-Cord-for-Nikon-MC-DC2/5094780/product.html
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