MUST BE INSERTED - It is not battery powered. It must be used in conjunction with a 5V/2A power adapter (included). There is a memory battery inside that remembers your settings even when disconnected, suitable for all indoor occasions such as bedrooms, living rooms, offices, bathrooms, hotels, etc. MULTIFUNCTION DIGITAL TIMER CLOCK-- This large display timer clock has three alarm functions: daily alarm, weekend alarm, and weekday alarm. You only need to press the mode button to change the mode, which is simple to operate. User friendly design, month, date, week, night light, 12 or 24 hour display format, indoor temperature display unit in ? or ?, to meet your various needs. In addition, it also has a built-in battery to prevent power outages. AUTO/MANUAL ADJUSTABLE BRIGHTNESS -13-inch alarm clock with high-definition display screen. Clear and eye-catching giant numbers. There are two brightness modes available for you to switch between manually or automatically, and you can set the monitor brightness to levels 0-5. The bottom night light allows the clock to adapt to various environments, with a 5 level brightness control to create a good atmosphere. You can adjust the brightness or turn it off as needed. REMOTE CONTROLLED SMART ALARM CLOCK -The time, date, week, daylight saving time, and temperature are displayed on the same screen, providing you with a clear and comfortable visual experience, and important information is clear at a glance. More importantly, this practical LED clock does not have any complex buttons, and there is no pressure when setting the time or alarm clock. Perfect for kids, elderly people, and visually impaired individuals. DYNAMIC RGB COLORFUL COLORS-13-inch alarm clock with high-definition display and 5 different single segment color modes for letters, plus 3 different multi color modes. A convenient remote control allows you to change colors, so you can have a color or custom color alternation.