Visioneer XP 450 - Manual (Page 90)

S ELECTING N EW S CAN S ETTINGS FOR THE S CAN B UTTON 85
2. Click the Properties button.
Your scanner has a built-in power saving feature that is set to power
down after 15 minutes of idle time. You can change the time before
the scanner powers down, from 1 minute to a maximum of 10
hours.