Source google image: http://cdn1.itpro.co.uk/sites/itpro/files/styles/article_main_wide_image/public/2016/02/raspberry_pi_zero_-_pi_2_size_comparison.jpg?itok=8cfvPLoc
Raspberry pi 3 zero

Source google image: http://cdn1.itpro.co.uk/sites/itpro/files/styles/article_main_wide_image/public/2016/02/raspberry_pi_zero_-_pi_2_size_comparison.jpg?itok=8cfvPLoc