Hi all, quick update.
I also bought one and it workd like a dream filled up my 285/70/17 on my RAM from 10PSI to 36PSI in 1 minute and 55 seconds so extremely impressed and happy with it and as @Lisa Pemberton said it works with a remote which is a trear. in terms of the warranty as @sertac mentioned you do have
that exact warranty slip in the box along with a stamped and signed receipt. so the 5 year warranty is legit.
if anyone wants to speak to Allan the guy from Ravon auto regarding these please let me know and ill share his details.