Would it be possible to get another fob? If so, you could mail it to me and I could do some analysis on it. If it’s 125khz then chances are good that it’s either EM41xx or Indala… but my bet is on EM41xx because the alarm company is an alarm company, not an RFID / Access Control company… so they probably went with something very cheap, easy, and generic… so my bet is that this fob is EM. You should be able to buy a simple cheap EM only blue cloner from Amazon and use that to clone the fob to your xEM. Once you receive the cloner, power it on and put it up to your fob and tap the read button. You should hear a beep or two beeps. That will mean it can read your fob, which also means it can write that data to your xEM… but before you attempt the write procedure, let me make a video that walks you through exactly how best to use the cloner to do that and minimize risk of page tearing your xEM.
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