What are these?

[worriedniece]

As the title says... there are a few of these scattered around the house and they say they have expired. I have no idea what they are if if I actually need to replace them.

Google lens tells me that they are moth repellers

Oh well done! Never seen them before
www.pestcontrolhub.co.uk/acana-airing-cupboard-moth-killer-and-freshener/?tagrid=53005791&utm_source=bybuybye&utm_medium=css&utm_campaign=nmpi&utm_term=generic&utm_content=generic&gclid=Cj0KCQjwl92XBhC7ARIsAHLl9alIaa0n0r37ST7Xr1rr3qO1ENzC6dtAZvFCkY9m6eFN3ihZSKwmCa0aAiwXEALw_wcB&gclsrc=aw.ds