Automotive remotes and keyfobs with FCC ID EZSDEI . . . are products of Directed Electronics. DEI markets aftermarket alarm systems under many brands, including Automate, Avital, Clifford, Python and Viper (to name just a few). There are also sub-brands such as AviStart, Concept, IntelliGuard, Matrix and many others.
Many of the replacement remote controls for DEI systems are interchangeable. However, others are not, and it is not always easy to tell by looking at the remote or by the FCC ID shown on the back of the case. Sometimes, the only difference is the brand or logo on the case. At other times, the case shape and number of buttons differs. So, if you are trying to replace your old DEI remote control, be sure you are dealing with a knowledgeable vendor so that you get the right keyfob.