1. The brightness of the LED display can be manually adjusted. 2. It is equipped with a built - in button battery, which can keep the product settings unchanged and the time running normally when the external power is cut off. 3. It features a high - definition red projection that can rotate 180 degrees. 4. It can be used as a mirror. 5. The product can adjust the display brightness according to the ambient brightness. 6. Dimensions: 18.5 x 4.5 x 9.1 cm. 7. Materials: Plastic + Acrylic. 8. Color: White. 9. Package contents: - 1 alarm clock - 1 USB cable, 1.5 meters long 10. Only the above package contents are included, and no other products are included. 11. Note: Light reflection and different monitors may cause slight differences between the color of the items in the picture and the actual product. A measurement error of +/- 1 - 3 cm is allowed.