Simple and easy to use when giving crucial lifesaving oxygen until medical help arrives. Featuring durable case, clear cover, 2-step instructions, simple on-off lever, and constant reading supply gauge. Portable, with handle, the unit hangs on the wall with your first aid supplies. It is an inhalator for a breathing victim and a CPR resuscitator adjunct for a non-breathing victim. Oxygen-enriched mouth-to-mask resuscitation with hygienic one-way valve on LIFE^® mask. Low-cost, refillable, 90-minute supply. Non-prescription. Shipped full and ready to use, with wall bracket.