Specifications: The luminous LED display alarm clock has gears of brightness for adjustment. It is plug and play with low consumption, which is convenient to use. You can wake up with 40 different ringtones. Each alarm rings for 2 minutes. With plug in operation, 5V 1A adapter is recommended. Built-in CR2025 button battery is for the memory function not for light. You can place it on the desktop or hang it on the wall. It has functions of alarm clock, date and temperature display and music playing. For temperature display, Fahrenheit and Celsius degree can be exchanged. It has memory function, which required no setting after power off. 24-hour and 12-hour systems can be exchanged. Item Name: Alarm Clock Material: Plastic, Glass Battery: CR2025 Button Battery (Included) Features: Multifunction, Large Screen, Luminous Size: 26.5cm x 7cm x 3.5cm/10.43" x 2.76" x 1.38" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Alarm Clock 1 x USB Power Cable 1 x User Manual