QCheckBox{
border:0px;
}
QCheckBox::indicator{
  width:79px;
  height:34px;
}
QCheckBox::indicator:unchecked{
  image:url(ui/images/off.png);
}

QCheckBox::indicator:checked{
  image:url(ui/images/on.png);
}

QCheckBox::indicator:unchecked:disabled{
  image:url(ui/images/off_disabled.png);
}