Max PSP (Power Save Protocol / Power Save Mode)
Max Power Save Protocol (Power Save Mode) is recommended for devices where
power consumption is a major concern, such as small battery powered devices. It
causes the Access Point to buffer incoming messages for the Wireless LAN Adapter
card, which must wake up periodically and poll the Access Point to see if there
are any buffered messages waiting for it. The Wireless LAN Adapter card can
then request each message, and then go back to sleep.