The vertical battery grip VG-XT4 is designed to be Dust-Resistant, water-resistant and capable of operating at temperatures as low as -10 DegreeC/14 DegreeF, and holds two additional batteries to increase the maximum number of shots to 1, 100 (in normal mode). the grip features a shutter release button, focus lever, AE-L button, af-l button, front and rear command dials, Q button and fun button to provide the same level of excellent operability with vertical shooting as with horizontal.