Bought the Energea Travelite 34W 5V/6.8A 4-Port Wall Charger  for S$59 (S$53.10 after 10% member’s discount) at Bugis Junction’s Challenger.
This is a 4-port charger that is capable of a combined output of 6.8A. Two ports have a max output of 1A each, and the other two ports have a max output of 2.4A each.
It comes with a US 2-pin to UK 3-pin adapter.
Despite the name of the product, I do not intend to use it as a travel USB charger. I am going to use it in my master bedroom where I need a USB wall plug to power three USB devices: Sensibo Sky, Amazon Echo Dot, and Li Xiang’s Clarisonic Aria Facial Cleanser. The fourth USB port is a spare.
It is hard to find a 4-port USB wall charger, and it seems the only model available is from Energea.
I have been using Energea 2-Port Wall Charger , and I am pretty satisfied with the quality of it. That is the reason why I decided to go back for it.