Question about Philips TAR5505/10

You can activate the sleep mode, in which the screen is dimmed and only the time and date (if enabled) are displayed.

Manufacturer's note: - If the system is inactive for 15 minutes, the radio
automatically switches to standby mode. - To increase battery life, you can turn the unit off completely by pressing and holding the button. Press and hold
and hold the button again to turn the unit back on.