NIU Niutek 3.5B official Pictures. NIU Niutek 3.5B is a Smartphone of niu. The NIU Niutek 3.5B Android Smartphone. Announced Mar 2013. Features 3.5″ Display, Spreadtrum SC6820 Chipset, 3.15 MP Primary Camera, 1300 MAh Battery, 512 MB Storage, 256 MB RAM. NIU Niutek 3.5B price starts.