Free pulse oximeter

I received this message in my “Filtered messages” folder on Facebook:

Free pulse oximeter for my UK friends, ur best personal health monitor or carer.
We will full refund after shipped by pp, so if you buy it , maybe you could receive refund in the same day.

Or “maybe” you won’t receive a refund and will have sent money to a scammer who will send you nothing in return.

I’ve said I’m interested. I’ll tell you how much this scammer thinks I should send.

“Nathaniel Clark” has replied:

we will ful refund after review and cover pp fee and 3 commision.
if you interested it please give me your pp and profile link