Remotes for the Forza1000 garage door opener originally came with two types of remotes; Forza-Red and Forza-Silver, with different types of formats.
Froza-red comes with a red cover. Forza-Silver comes with a silver sliding cover.
Both are now obsolete and have been replaced with new style remotes.
Forza-red has been replaced by the Forza2000.
Forza-Sliver has replaced by the Forza4000. See the link below for more information.
This one has been upgraded to Forza2000.