Asus TX300CA - Manual (Page 71)

ASUS Transformer Book E-Manual 1
Instant On
Save battery power while your ASUS Transformer Book is on deep
sleep mode (Deep S3) using Instant On.
NOTE: Deep S3 is a technology that lets you save more battery power
while your ASUS Transformer Book is on sleep mode.
IMPORTANT! The standby time varies according to your ASUS
Transformer Book's remaining battery capacity, computer model,
configuration, and operating conditions.
Performance mode
This mode is default-enabled in
your ASUS Transformer Book. It
allows the system to return to its
last working state in two seconds,
even after your ASUS Transformer
Book has entered into deep sleep
mode.
Battery saving mode
This mode enables longer standby
times allowing the battery to
last for up to thirty (30) days or
more. When enabled, the ASUS
Transformer Book returns to its last
working state in as fast as seven
seconds, four hours after entering
into deep sleep mode.
or
Tap this to activate the
battery saving mode.