What is the maximum operating altitude of the Epson viewer?

• The Epson P-6000 has a maximum outdoor operating (or charging) altitude of 9,842 ft.
  
  Notes:
  • Because temperatures are typically lower at high altitudes, be careful not to use the P-6000 unless the ambient temperature is between 41° and 95° F (5° and 35° C).
  • The non-operating maximum altitude is 39,370 ft.