Up through the middle of the last decade, Toyota often added keyless entry systems to Japanese-made vehicles after they landed in North America. A few different keyless entry systems were used. One of the common ones uses a 4-button remote key fob with FCC ID ELVATDD on the back. The panic button on this remote is on the back of the key fob.
See Toyota remote with FCC ID ELVATDD here.
Earlier versions of this remote may have looked slightly different, but the image shown at the link above is the current replacement key fob. These port-installed or dealer-installed systems are user programmable.