The Nikon 1 S2 is a digital mirrorless interchangeable lens camera announced by Nikon on May 14, 2014.
Features Improvements and changes over the previous S1 model include: Higher resolution, with the S2 having a 14.2 MP sensor (S1 had a 10.1 MP sensor) Continuous shooting rate increased to 20 fps (60 fps with fixed focus) Autofocus points increased to 171 focus points ISO range up to 12,800 Video had a better high-framerate option of 1080/60p Battery life increased to 270 shots per charge, compared to about 220 shots on the S1 S2 uses the smaller microSD storage cards.
See also Nikon 1 series Nikon 1-mount List of smallest mirrorless cameras
References
http://www.dpreview.com/products/nikon/slrs/nikon_s2/specifications