"Key chains" refers to a small loop or holder that is used to keep your keys together in one place. It can be attached to a keyring, bag, or belt loop for easy and convenient access to your keys. Full definition
If a brand is all about making photo frames, then they could give key chains with a small photo frame tied along with it. (smallbusinessesdoitbetter.com)
Make sure he is exposed to everything from key chains to vacuum cleaners and in between. (ipupster.com)
They're showing up as key chain accessories that can be attached not only to your keys, but also to bags. (poshscene.com)