They are hardware signing devices, not wallets. A wallet is software that allows for receiving, signing (with or without hw signer), sending (broadcasting) and managing bitcoin transactions.
But since this is too much information for normal users we call them hardware wallets. 

 Yes you are right, but since people don't usually call them that, I thought you were asking me about a Nostr signature device 😂  

 Haha well there is one that can do both! https://shop.lnbits.com/product/nostr-signing-device