4-inch three-dimensional digital alarm clock creative classic mute students loud double bell ringing 1. Loud alarm clock: The alarm clock is so loud that you will never hear it - also suitable for deep sleepers. Only two buttons are needed to set the time and alarm time, the operation is very simple. 2. Noiseless: No annoying ticking sound, the wriggling second hand creates a quiet sleeping and working environment. 3. Good readability: 4-inch dial, three-dimensional numbers, good contrast between black and white dials, making the time clear and readable. 4. Night Light Function: Pleasant light helps you read the time in the dark. Simply press the light button to activate the LED light on the dial. 5. Humanized design Our wind-up clock is easy to use, there are only four buttons on the back: two knobs for setting the clock and alarm, one alarm switch for on/off and one night light button for on/off Show time in the dark, very easy to use