YOU MEAN THERE ARE DIFFERENT KINDS OF MACHINES?IAMB TRYING TO LOCATE A SYSTEM I CAN USE WITH ONE HAND AS I HAD A STROKE AND ONLY HAVE USE OF ONE HAND TO GET THAT MASK OFF AND ON,OFF IS EASY,BACK ON IS VERY HARD.IM NEW TO THIS SITE AND HOPE TO GET THE HELP YOU SEEM TO HAVE GOTTEN
THANK YOU
KATFISH