According to CNET, there is no single manufacturer of the Viore brand. CNET points to a result from Panjiva that shows eight different manufacturers shipping under that name, as of 2015.
CNET goes on to explain that the Viore brand owners contract out the manufacturing process; they do not build the units themselves. Each of the different manufacturers can then label their devices with the Viore brand. There can be variations in the products sourced from the different manufacturers.
The manufacturers listed by Panjiva include several different Chinese companies, such as Shenzhen MTC, Zhejiang Tianle Digital and Ce Digital. The brand is marketed in the United States primarily through WalMart and Sam's Club.