You would need to install this yourself, you can find instructions at the bottom of the specifications section. - https://www.pbtech.co.nz/product/DVAMIX18554/Xiaomi-TV-Box-MI-Box-S-Media-Player-4K-Ultra-HD-St
Yes PBTech are official seller. Comes with NZ USB 5V power block, and includes HDMI cable. Remote does not have batteries so you need 2x AAA - I recommend Eneloop rechargables.