Nikon MB-D15 Battery Grip Category_Reflectors and a linear motor that

and a linear motor that delivers high-speed AF performance

Rechargeable L-ion Battery D-LI109 for the K30 & K-r

It is provided with a full set of EF lens contacts

A large bright 50mm front lens element compliments a sophisticated optical design of 10 individual lens elements in 9 groups

Furthermore

Nikon MB-D15 Battery Grip Category_Reflectors and a linear motor thatThe MB D15 is equipped with a shutter release button, AE AF lock button, multi selector, and main and sub command dials for improved operation when taking photographs with the camera vertically oriented. The MB D15 Multi Power Battery Pack can be powered either by six AA batteries (Alkaline or Ni MH or Lithium), or EN EL 15 rechargeable Li ion batteries. To use the MB D15 with AA batteries, use the MS D14 AA Battery Holder. When using EN EL15