Large LED display brightness can be manually adjusted Built-in a button battery external power off keep the product settings unchanged and the time normal time HD red projection with 180 degree rotation It can be used as a mirror The product automatically adjust the display brightness according to the ambient brightness size: 18.5 x 4.5 x 9.1cm Material: plastic+acrylic colour: black and blue Package Contents: 1 x alarm clock 1 x 1.5m USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.