Marksman X9 Aftermarket Alarm System Companion Remote with FCC ID H5OT21

The 2-way Marksman (Magnadyne) X9 aftermarket alarm system uses two remotes, a 2-way LCD remote with FCC ID H5OTR17 and a 1-way companion remote with FCC ID H5OT21. The 1-way remote has 5-buttons.

See 1-way companion keyfob remote at this link.