I bought a 16" tern setups portable monitor (https://ternsetups.com). 

The power supply that is provided is a 2 pin socket, with the following inputs and outputs.

MODEL: PD30-EU (Shenzhen Jiuzhou Power Technology Co., Ltd)
INPUT: 100-240V~50/60Hz 1.0A
OUTPUT: 5.0V -==3.0A / 9.0V=-- 3.0A / 12.0V = 2.5A / 15.0V -- 2.0A / 20.0V =- 1.5A

The specification from the tern setups website states, Pass-through power capability (40W)

The manual states - Do not exceed 5V DC input Power.

I approached tern setups who said I don't really need the power supply as my Mac will power the monitor, this is true but I would still like the option of a power supply. 

I need help in understanding and finding a suitable power adapter with a NZ socket please.

Thank you