NIU Niutek 3.5D official Pictures. NIU Niutek 3.5D is a Smartphone of niu. The NIU Niutek 3.5D Android Smartphone. Announced Dec 2013. Features 3.5″ Display, MT6572 Chipset, 2 MP Primary Camera, 1400 MAh Battery, 512 MB Storage, 256 MB RAM. NIU Niutek 3.5D price starts.