Simple and easy to use when giving crucial, lifesaving oxygen until medical help arrives. Features a durable case, clear cover, 2-step instructions, simple on-off lever, and constant-reading supply gauge. Portable with handle. Hangs on wall with first aid supplies. It is an inhalator for a breathing victim and a CPR resuscitator adjunct for a nonbreathing victim. Oxygen-enriched mouth-to-mask resuscitation with a hygienic, one-way valve on LIFE® mask. Low-cost, refillable,90-minute supply. Nonprescription. Shipped full and ready to use, with wall bracket.6 & 12 LPM Unit has a high setting for the recommended 100% inspired O2.