Usage Tips:Product Material: metal + quiet movementSize of the alarm clock: 4 inches 17 * 12 5 * 6cmBattery type: 1 * AA 1 5V (not in Scope of delivery)Operating voltage: > 1 4VApplication: living room, bedroom, kitchen, clinic, office, etc Note: Please select the suitable alkaline battery for use Package included:1 * alarm clock1 Loud alarm: The alarm clock is very loud, you definitely can't overhear it - also perfect for deep sleepers Very easy operation with only two buttons for setting the time and alarm time 2 Noiseless: No annoying ticking, the creeping second hand creates a quiet sleeping and working environment 3 Good legibility: 4 Inch large dial, stereoscopic numbers, black and white dial has a good contrast, so that the time can be clearly read 4 Night light function: The pleasant lighting helps you to read the time in the dark Simply press the light button to activate the LED lighting of the dial 5 User-friendly design Our wind-up clock is easy to use, there are only 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, very easy to use