Just a tip for concentrator users. I am on the concentrator 24-7, bottle only when going out. I have had been using the concentrator for 12 years so we understand each other. The other day the concentrator was not as quiet as before. So I checked the filter and it was clean. Through the many years I have learned to pay attention to sounds. I was about to call my O2 provider when all of sudden my alarm on my oximeter started beeping and it said my 02 was at 84 and pulse at 40. Then the concentrator stops and the alarm started screaming. I am 86 years old and don’t walk but with a walker, so I don’t move as fast as a few years ago. But, like the question being asked, Do You Have a Safety Kit? Well I do, my very ancient years ago of studying EMS and Fire Response prepared me several years ago to have my kit to be within arm’s length always. I quickly switched tubing to my small bottle of O2 and because my oxygen was not coming up fast enough, I put the cannula straight on to the small tank. Sat back, said thanks and immediately called for a new concentrator ASAP! Hope my little life experience with my concentrator is helpful to someone and all you people who don’t have a emergency kit, get them put together. It may help in the future.