I have Xena too that my brother got me couple years ago. Yes, it's loud, but in narrow range of frequencies, so not as over-powering as can be.
I think it's going to take 2nd alarm for SMS alerts like you want. This feature is typically bundled with silent GPS-based alarms that send:
- alert that your bike has been tampered with
- alert with GPS-coordinates of your bike
I even saw micro unit that fits underneath bicycle seats. However, that one requires communicating on mesh-network of other identical alarms. Otherwise it's blind. I think cell-based one will be better.
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