Will the Z1/Z2 work at an elevation above 8,000 ft.?

The Z1 and Z2 have been tested at altitudes up to 8,000 feet. We cannot guarantee the operation of the device above 8,000 feet.

Note: The Z1/Z2 will work in an aircraft flying higher than 8,000 feet because the cabin is pressurized to 11 to 12 psi, approximately the atmospheric pressure at 6,000-8,000 feet.