It is crucial to carefully read the guidelines before using this device.Make sure to install the batteries and connect the power supply in advance.This gadget runs on USB power and requires a stable power connection.This is a 4-digit LED screen that has five main functions: Clock, Date, Temperature, Night, and Alarm.It is controlled by five buttons: MODE, ALARM, UP, DOWN, and SNOOZE/LIGHT.The device shows the time, date, and temperature, and it has a feature to prevent disturbances at night.When not in setup mode, holding the snooze button for over three seconds will turn off the display to prevent sleep disruption from the screen's brightness.In the screen-off mode, any button can be activated.6.Snooze function: When an alarm sounds, pressing the snooze/light button activates the snooze function, enabling you to determine its length.Pressing any other button will deactivate the snooze function.7.Energy conservation function: While running on battery power, in all modes (except during an alarm or when it is not configured), the LED screen will turn off automatically after approximately 16 seconds of no activity, entering a power-saving state.However, the system continues to operate normally for timekeeping and temperature monitoring and retains previous settings.8.A function to modify brightness in three stages: Utilize the UP button to cycle through three brightness levels.9.Automatic brightness adjustment capability: From 6:00 PM to 6:00 AM, the brightness will automatically lower.The adjustment range can be set up. 10. It has a time memory function that runs on 3 AAA batteries. 11. The voice activation feature allows the display to be activated by a voice command when using only dry batteries, and it will turn off by itself after 16 seconds.