Product Description Material. Acrylic + plastic Display screen. Digital LED Power supply: 5V/1A Battery. CR2032 Power supply: USB (USB cable included) Function. Time display / alarm clock / hypnosis Size: 24*9.4*4.2cm Package. 1 x LED Digital Alarm Clock 1 x USB Charging Cable 1 x clock manual 1. MODERN DESIGN: This alarm clock offers a choice of 12-hour/24-hour formats. You can set 12 hour mode or 24 hour mode by pressing the "+" button for 3 seconds. The large 24*9.4cm 3D LED display is easy to read at night and the time is clear at a glance, especially suitable for children and the elderly. 2. adjustable brightness and nightlight: 3 brightness levels, you are free to adjust the digital wall clock according to your needs. From 6:00 p.m. to 6:00 a.m., the digital LED alarm clock is smartly lowered by 20%. If you need a night light, this electronic wall clock is the best choice for you. 3. EASY TWO-WAY INSTALLATION: Effortlessly install it as a wall clock using the built-in keyhole, or as a desk clock using the fixed base. It takes up very little space in your room or in your luggage when traveling. Our electronic clocks can also be conveniently used in kitchens, hotels, tables, desks, desks or bedside clocks. 4. Alarm clock and snooze function: the multifunctional digital clock has an alarm clock function and a snooze function. And the snooze time can be set freely. This digital alarm clock is a fantastic Christmas gift for children or teenagers. 5. energy saving and respect for the environment: Ultra low power consumption, low cost LEDs and only 5V is required to connect to the USB port. Convenient USB port, usable everywhere. Warm advice. The lithium battery (included) just has memory function and can provide power, it just can be powered by USB (included).