Buy from Amazon.com : http://fave.co/1Hv9gQB

DSTE Professional Vertical Battery Grip Holder w/Wireless Remote Control for Nikon D3100 SLR

Product Description :
Package Contents Battery Grip Pack for Nikon D3100 Wireless Remote Control
Has the same functions as original grip 100 Brand New Warranty 24 Months
It comes with a signal transferring cable with which you will be able to use a shutter release
Hold two EN-EL14 or six AA batteries to double your shooting time
Add a Vertical-grip shutter button you need to contact the cable that we offered with the camera convenient for Vertical Shot