Acer P1200 - Manual (Page 43)

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English
Management
ECO Mode Choose "On" to dim the projector lamp which will lower power
consumption, extend the lamp life and reduce noise. Choose "Off"
to return normal mode.
High Altitude Choose "On" to turn on High Altitude mode. Operate the fans at
full speed continuously to allow for proper high altitude cooling of
the projector.
Auto Shutdown The projector will automatically shutdown when there is no signal
input after the allocated time. (in minutes)
Lamp Hour Elapse Displays the lamp’s elapsed operating time (in hours).
Lamp Reminding Activate this function to display a reminder to change the lamp 30
hours before its expected end-of-life.
Lamp Hour Reset
Press the button and choose "Yes" to turn the lamp hour
counter to 0 hours.