The first Merece tire inflation pump I bought was dead on arrival. Literally. The device wouldn't turn on before OR after 4+ hours of charging, and neither would the attached LED flashlight, so I knew something was obviously wrong. Later that day I emailed the Merce support staff at the email address provided and within ten minutes I received a reply from the support staff telling me I was getting another brand new tire, this time one fully functional tire pump. and that it will be accelerated. Well I didn't lie! Two days later I received a brand new, fully functional device which, after testing on two sets of car tires and two basketballs, I can say with 100% certainty that this product works perfectly. Excellent and fast service (when needed) and a very light, portable yet powerful tire inflator that definitely saves me the brutal trips to the gas station when it's 10Β° outside just to inflate my tyres.