What is this component?

I found what appears to be some sort of emitter or receiver when disassembleing an air quality monitor. What is it? It does have a lens on the front.

https://preview.redd.it/fa01k2mh1hkg1.jpg?width=3264&format=pjpg&auto=webp&s=ab0f535f8ee9aa4bedf5ebc78873b37e59ba9445

https://preview.redd.it/5egemzej1hkg1.jpg?width=3264&format=pjpg&auto=webp&s=c795939f8de6e16b1195cec899b238dd6b8863c1

https://preview.redd.it/00dmi1pm1hkg1.jpg?width=3264&format=pjpg&auto=webp&s=ea11e29fe90ffc1c87780df032ee9b677092d5e4