IT City

Combination power cables:

Bought in “IT City” tbd250 (just next to the Phungnai Bakery: super market upstairs):
The whole set: plug (universal plug for travel) + cable bar

Plug (universal plug for travel) tbd40 or 50: can buy in 7 ELEVEN food store:

 

Universal plug for the world (USA/AUS, UK, EU, Thailand, USA=HK travel)
I used HK$200 in exchange for this plug which contains 4 USB with my group roommate in Chiang Mai (this kind of plug cannot be bought in HK):

Other sides: