Non-Mirror(Black) Digital Alarm Clock, Digital Clock Bedside Alarm Clock Morning, Voice Activated Adjustable brightness: clear and comfortable viewing, automatic dimming at 6:00 p.m. The LED light always lights up when plugged in using a USB cable. When using battery mode, the screen will automatically turn off within 10 seconds. You can activate the screen with your voice or open it by pressing any key. Press and hold the Light/sleep key for 3 seconds in any mode to turn off the screen. Note: If the alarm is running on battery, it will turn on for 5 seconds then turn off and you can activate the opening screen by pressing the sound. Save energy and improve your night's sleep. If via USB, the clock will always be on. Easy to use and ideal gift: the clock has been designed with absolute simplicity in mind and you will have no problem using it . A sophisticated digital clock with accurate time for heavy sleepers, children, young people, students and the elderly - the advantageous dimensions make it an ideal choice for travel alarm clocks, desk clocks or bedside clocks. Note: The data are manual measurement, please allow a 1-3cm error, due to the differences between the light and the display, there will be a certain color difference, the specific received in kind prevail.