xg1v4 storage and rf remote control range

Can someone please share the usable RF range of the remote control for the XG1V4 4k X1 TV Box? As in, how far away from the receiver can you be and still have stable remote control of the UI via remote?

Also, how much internal hard drive storage does the XG1v4 have?

And does the USB port on the back of XG1v4 support external USB hard drive to expand local storage capacity?