Here's how it typically works:

Motion Detection: The PIR sensor detects changes in infrared radiation within its field of view. When a person or object moves into the sensor's detection area, it causes a change in the pattern of detected infrared radiation.

Voltage Compatibility: This module is designed to work with both 12V DC and 24V DC power supplies, offering versatility for various applications. You can select the voltage that matches your power source.

Ceiling Mounting: As indicated by its name, this module is suitable for ceiling mounting, making it suitable for applications where you want to detect motion from above, such as in lighting control.

Control Output: The module typically provides a control output, which can be connected to LED lights or other DC-powered devices you want to control. When motion is detected, the module activates the connected load, and when no motion is detected for a certain period, it deactivates the load.

Adjustable Settings: Many PIR sensor switch modules allow you to adjust various settings, such as the sensitivity level, the duration of the activation (time delay), and sometimes even the detection range.