I had a problem that occurred after the requested date but I contacted them directly. OHO's service is exceptional as we tried to resolve the issue. In order to solve the problem, we sent emails daily while we worked on a solution. They are in China, I wrote during the day and they replied at night. I looked forward to her reply every morning because our time zone is different. I felt like the support team was working on my issue while I was sleeping. Her English was excellent. There were no connection problems. These glasses are excellent quality and I've made some great videos; They were videos that were easy to edit and share. I picked up a lot while paddling since my hands were on the rudder. Video of dolphins and manatees. I couldn't have done it without these sunglasses. Gray Heron and an Osprey flew right in front of me! And my comments were obviously picked up by a microphone.