NIU Niutek 3G 3.5 N209 official Pictures. NIU Niutek 3G 3.5 N209 is a Smartphone of niu. The NIU Niutek 3G 3.5 N209 Android Smartphone. Announced Jun 2012. Features 3.5″ Display, MT6575 Chipset, 3.2 MP Primary Camera, 1200 MAh Battery, 256 MB Storage, 512 MB RAM. NIU Niutek 3G 3.5 N209 price starts.