Sony DPT-S1 User Manual page 10

Sleep mode
To extend battery life and prevent unintentional
operation of the touchscreen, set the Digital Paper
device to sleep mode by pressing the  (Power)
button. The standby screen appears.
To wake the device, press the  (Power) button again.
Automatic power-saving
The Digital Paper device will enter sleep mode after 1
hour of inactivity. After 3 days in sleep mode, it will
turn off (shut down) automatically. The automatic
power-saving cannot be turned off.
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