The product was not working upon arrival. Unfortunately I didn't have a chance to use it before the Revain return period was over. It literally took 34 days from purchase and died. The compressor just won't turn on. Now there seems to be no way to get a replacement for the item under warranty as there is no way to contact the seller. Updated: July 3, 2020 I found a way to contact the seller and received a response almost immediately. You replace the block. Very easy to use. No stress. Upgraded from 1 star to 3 due to fantastic customer service. I will update the review again after receiving and using a new device. Updated: October 26, 2021 I have used the product several times. It works as advertised. Easy to use. No complaints at all. I have inflated my tires several times with no problems and the device inflates them quickly. I am very satisfied with the product and have upgraded the rating to 5 stars.