Abee R22 Car Cam Recorder User’s Manual Page 14/185.13. Display BrightnessDisplay Brightness ItemsUsers can choose the display brightness from 10% to default 100%.5.14 FlickerFlicker ItemsUsers can choose 50 Hz or 60Hz (default) for flicker.5.15 Set ClockDescriptionUsers can set year, month, day, hour, minute and second under this item.Button Definition for Setting ClockButton Operation FunctionPress and Hold 2secs Switch OffPress N/A