Before you use the pad, carefully examine inner cover before each use. Discard the pad if inner covering shows any sign of deterioration. Make sure that you always use the pad with the cover properly in place - do not use the pad without the cover. Do not use in oxygen atmosphere. This applies to all oxygen enriched environments. Use the pad only on a 110-120 volt AC circuit. Unplug when not in use. Do not use your heating pad with liniment, salve or ointment preparations that contain heat-producing ingredients. Skin burns could result.