A:AnswerYes you can. I have one and I am using it in the Caribbean, St.Lucia to be precise where all electricity voltage is 220-240 and I am using a Stepdown Transformer.
A:AnswerThe remote uses infrared if it's not paired with the TV via Bluetooth.
I too am having issues trying to get my Harmony Hub to work well. This model does not show up in Harmony's database so I picked a similar model. It works via IR however the HDMI inputs do not work well since it doesn't have discreet codes and the remote doesn't have buttons for each HDMI input so I cannot train the hub using the remote control.
A:AnswerThe spec sheet claims "Motion Rate: 120"
Refresh rate depends on the HDMI port you use and resolution. There are 2 HDMI 2.0 ports and 1 HDMI 1.4 port