Multi mode display: This alarm clock also comes with three working day alarm modes. You can set time intervals: Monday to Friday, Monday to Saturday, and Monday to Sunday. Equipped with clock mode, alarm mode, date mode, temperature mode, and night mode, it can meet your daily needs. Dual power supply: This digital alarm clock comes with a 6.5-inch screen and large font, so you can easily read the digital display screen. It supports USB power and AAA. When using AAA, this alarm clock has a time memory function. Three levels of brightness and night mode: The digital alarm clock provides three different levels of brightness, which can be manually or automatically adjusted to comfortable brightness to protect your eyes and save energy at night. Note: When using USB power alone, the screen can remain open and there is no memory function after a power outage. Display screen type: LED Display type: Number Special function: decoration Special function: thermometer Special function: perpetual calendar Special function: alarm Special function: 24-hour indication Thickness: 10mm Shell material: plastic Dial material: plastic Color: black Specification: Green digital alarm clock