How do I adjust the sleep timer or power off timer to save energy on my ET-3850?

To change the sleep timer, press the home button and select Settings > General Settings > Basic Settings > Sleep Timer, then adjust the number of minutes using the + or – button. To set the power off timer, go to Settings > General Settings > Basic Settings > Power Off Timer, and select a time period between 30 minutes and 12 hours. (Page 25)