You need a license issued by California's Bureau of Security and Investigative Services. The agency is under the auspices of California's Dept of Consumer Affairs.
Two felonies will be a high hurdle for BSIS licensure in California. Here is the link for California laws, rule and regulations. http://www.bsis.ca.gov/industries_regulated/alarm.shtml
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State licensing for an applicant with prior felony convictions almost always involves cleaning up the applicant's criminal record. California's alarm-related licensing agency, BSIS, will be reluctant to license a salesperson with two felonies. But it may be possible for you to bring a petition in court that will result in one or both of those felonies to be reduced to a misdemeanor or even to be dismissed. (This is what California offers in lieu of "expungement.") That procedure does not take long and does not cost much money. You should definitely look into it. Contact your former criminal defense attorney for help or inquire at the local office of the public defender. The court in your jurisdiction may have forms that you can fill out and it may be possible to get this kind of post-conviction relief even without an attorney. These court remedies will make California licensing in any field a great deal more likely.
If you are still on probation, you will need to have your probation successfully terminated before BSIS will issue you a license. If your probation is more than halfway over, then you can ask the court to terminate it early.
Most likely you can handle all of these post-conviction remedies in one appearance before the court at the same time. Please look into these measures -- the benefits to you can be significant and will last the rest of your life. Best of luck.
Mike Claessens, License Advocates Law Group