A:AnswerYou should be fine, but if you want to be 100% certain of safety get standard 3 prong power cable that will fit into the AC/DC adaptor and is rated for 220v, odds are the one that comes with it is only rated for 125v.
A:AnswerThe Thunderbolt 3 port works fine on mine. It's got all the software pre-installed as well to run thunderbolt peripherals. I also tested it with a USB-C drive and it worked fine.
A:AnswerI just purchased this laptop and put one M2 in the slot.. it works great.. at present according to ASUS the second slot for PCIe is for 'future use' They did not specify