Aputure battery grip is designed for digital SLR camera design of multifunctional battery handle,it can be loaded into the lithium battery,or AA batteries.
The battery handle with a longitudinal shifting wheel,AE / lock button,and the longitudinal position of the AF box selection buttons,so you in the vertical shoot when more convenient and stable.
The Power Grip is powerful,versatile,and comfortable.
It extends the battery life of your DSLR camera,it offers a secondary shutter release button for vertical and portrait shooting,and includes special function buttons for more shooting options.
It comes with a tripod mounting thread as well.
The item you purchased is a Pro Battery Grip for Nikon D3100.
It has a built in vertical shutter release button,and can hold two EN-EL14 rechargeable battery packs.
Additionally,it comes with a signal transferring cable with which you will be able to use a shutter release.
Add a Vertical-grip shutter button (you need to contact the cable that we offered with the camera),convenient for Vertical Shot.
Hold two EN-EL14 batteries to double your shooting time.
Significantly improves stability
Very suit for portrait shot
Tripod screw mount
No main control dial wheel and exposure control dial function
With half press focusing function
1X BP-D3100 Battery Grip
1X Connecting line
1X User Manual