Set the time, date and automatic brightness function: In the normal display state, press and hold the setting key at the top for more than 1 second to enter the time adjustment function. When the hour starts to blink, short press the key to change the value, long press the key to enter the minute adjustment, minute blink, short press the key to change the value. After setting for minutes, press the button long to enter the second adjustment, and press the button short to return to zero. After the adjustment, long press the key to enter the adjustment of brightness function, LL: 3 is displayed, short press the key to change the brightness. 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. Finally, press and hold the key to save the Settings and exit the Settings. Tips: The product may be updated constantly , Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Material: plastic colour: A-black background Green light Package Contents: 5 x Clock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.