Question about 4smarts SkyTag Wallet Set of 2

No, but it works with Icloud+find my. I use it for my wallet. All you need is an Apple account and from the site you can locate the device. Personally, I use it with my Samsung Galaxy S24 Ultra, so all you need is the website link.

Unfortunately I don't know that. I don't use Android.
Unfortunately, it doesn't work reliably with iOS either. After a few days it no longer connects and forgets everything. No longer use the item. A bad buy.

only one of the two works