I cannot directly determine the generation of the Nest Protect sensor with the product code S3003LWFD. However, to identify whether a Nest Protect is first or second generation, you can check the physical characteristics such as the rounded edges for the second generation, or look at the serial number on the back label for codes starting with 06A or 06C for the second generation.You can also check the serial number on the back label for codes starting with 06A or 06C for the second generation.

It‘s 2nd generation. Ordered it quite a while ago and it was a 2nd generation device.

Is also a smoke or fire detector. Correct, this model can be connected directly to 220V, whereby this is provided (without earthing) by means of a small plug supplied. It is therefore easiest to install on a ceiling light point.

According to the manufacturer, the nominal voltage is 230 volts. See link: https://dcs.dk/en/p/nest-protect-flerfunktionssensor-hvid-999078476