Very pleased with purchases, the oxygen converter is working perfectly on level 4 at the moment very handy for getting about shopping gardening hospital visits etc, it keeps my oxygen level accurate. I also purchased the larger capacity battery and this really makes a big difference extending the usage time . I will definitely purchase another larger battery when funds allow as this will make life easier still. It’s good to be able to charge the batteries independently from the machine. Still take oxygen bottles in the car and wheelchair, but like the machine very much.also the batteries stay charged when not in use. Plus the bag for transporting the machine is very useful.
Extra Replaceable Lithiumion Battery Oxygen Concentrator Accessories VP-2