Device used 1 time worked fine, used it again a few weeks later and it made a popping noise and stopped working. The display didn't even turn on. Called Revane and they said the return window was closed. I explained that it said it was 1 year warranty and I wanted a refund. Of course, they don't understand English and insisted that refilling is chargeable. How can I be charged for returning a defective product under warranty? Very disappointed with both the soldering station and Amazon. Stay away from this junk product and do yourself a favor and buy a reputable brand.