Product Name: digital alarm clock Material: plastic Size: 7.2 * 4 * 1.8cm Specifications: The brightness of the LED display will be dimmed by 50% between 19:00 PM and 6:00 am, which will not disturb your sleep, thus saving energy and protecting your eyes. You can set 3 groups of alarm time to wake you up every day. You can get more minutes of lazy sleep time, and the alarm clock will remind you again. 3.1 inch large LED display, mirror, clear and easy to read. It is not only a clock, but also a fashionable art decoration, which is very suitable for bedrooms, living rooms, kitchens, cars, offices and other places. High quality plastic, anti-aging, practical material, can be used for a long time. The product can be used with a USB cable or a button battery (the product does not have a battery, and you need to buy it yourself) Package Included: 1 * timer 1*USB Notes: 1. If the screen of the product you received is scratched, please remove the protective film. 2. If the screen suddenly turns off, please check whether "on SD" is set. This mode is a power saving mode and will automatically turn off and light up. Please reset to "- SD" mode. This mode will turn off and always point to the LED 3. If the USB cable and adapter still do not work after you receive the product, please check whether it is 5V. If the above problems can not be solved, please contact me as soon as possible, do not open disputes and leave bad comments. We will try our best to solve the problem.