0.36 Inch 6-Bit Clock LED Digital Electronic Clock W Second Display Module Power

Then long press the key to enter the automatic brightness function switch setting, display AL: x, short press the key to change the value, AL :0 is off, AL: 1 is on, when AL: 1, the display will automatically change to level 1 brightness after 19:00 in the evening, and automatically change to the brightness value in the Ld setting after 7:00 in the morning.