Adjustable Brightness: the display brightness of this digital clock is 3 level adjustable. You can easily adjust to your favorite or suitable brightness level, which is vision friendly, no glaring light at night yet still bright enough by day.
Voice Control: this clock has a sound control function. When there is no sound, the screen automatically dims; And the screen automatically lights up when there is sound. When the sound exceeds 60 decibels, the voice control mode can be awakened. To activate or deactivate this feature, simply press the "Down" button to toggle On or Off, which are indicated as "ON: Sd" and "--: Sd".