Product description Material: metal + quiet movement Size of the alarm clock: 4 inches 17 * 12.5 * 6cm Battery type: 1 * AA 1.5V (not included) Operating voltage: > 1.4V Application: living room, bedroom, kitchen, clinic, office, etc. Note: Please select a suitable alkaline battery for use Package included: 1 * alarm clock 1 Loud alarm: The alarm clock is extremely loud, ensuring it won't be missed - ideal for heavy sleepers. Very simple operation with only two buttons for setting the time and alarm. 2 Noiseless: No distracting ticking noise, the smooth second hand contributes to a quiet environment for sleeping and working. 3 Good legibility: The 4-inch large dial, with three-dimensional numbers, offers a strong contrast between black and white, making it easy to read the time clearly. 4 Night light function: The soft lighting assists in reading the time in the dark. Simply press the light button to activate the LED illumination of the dial. 5 User-friendly design: Our wind-up clock is user-friendly, featuring just four buttons on the back: Two rotary knobs for setting the clock and the alarm, an alarm switch to turn on/off, and the night light button to display the time in the dark, making it very easy to use.