Panasonic cordless phone kx tg3031b

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Hi there, wondering if you could shed some light. I have the above
cordless phone. It was supplied without a power adapter so i purchased
the appropriate adpater. The base unit required a 9V 500mA. Purchased
9V max 800mA adpater.

The unit works fine apart from there is an annoying clickingsound and
line noise. The phone line has been checked out ok. One other point is
that it is a US model and i am using it in New ZEaland. Is there any
major conflict?

Thanks for your help