Some are affected by Radio Signals and can set the alarm/immobiliser until you get our of range, it happened to us in France. Also what do you do on a long ferry crossing or shipping when the bike is loaded on the boat by someone other than you and the alrm goes off all the way across.
And anyway, alarms are a waste of time as the thieves just roll up in a van, pick up the bike, throw it in the back and they're gone, nobody sees it, nobody hears it (once it's in the van), you're much better off chaining the bike, through the frame, not a wheel that can be removed, to something solid.
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