The HW416B outputs 3.3V, which is safe for 5V Arduinos, but 5V logic can damage 3.3V-only boards. To be better safe than sorry:
Because the HW-416B uses the and similar passive components, 95% of the HC-SR501 datasheet applies directly . hw416b pir sensor datasheet better
Here is the for the HW416B, based on lab testing and community validation. The HW416B outputs 3
Since "HW416B" appears to be a generic batch code, you likely won't find an official PDF from a major manufacturer (like TI or Panasonic). For technical specs, look for datasheets regarding "Mini PIR Motion Sensor Module" or "AM312" (a common chip used on these small boards), as the specs will be nearly identical. Since "HW416B" appears to be a generic batch
Power input. Because it supports a wide range (up to 12V), you can power it directly from a 9V battery or a microcontrollerās 5V rail.