Primary manufacturer is Kidde but sold under many other names.
https://www.google.ca/url?sa=t&rct=...ischarge-and&usg=AOvVaw3OsP-fCakwp-BuJ4-0jJv1
https://www.google.ca/url?sa=t&rct=...ischarge-and&usg=AOvVaw3OsP-fCakwp-BuJ4-0jJv1