The following model support QC3.0:
Zenfone 3 Deluxe (ZS570KL)
Zenfone 3 Ultra (ZU680KL)
Q&A:
1. Please use ASUS 18W AC adaptor. The adaptor should with QC charge icon in red mark below:
PS: With other non original adaptor can't not charge ASUS cellphone in Q.C3.0 mode.
2. How to identify the cellphone is in QC3.0 mode?
Ans:You could see the icon while the cellphone is charing.