MTI TruTone - The #1 choice for Outdoor Warning System activation & TruTone-Gbrl now with Gbrl activation & monitoring. TruTone can utilize: -DTMF -Two-Tone Paging -Two Tone Sequential -FSK TruTone Gbrl utilizes data over sound using specific codes & commands, making it easier to activate and much more secure. TruTone-Gbrl is encrypted on private frequencies that aren't available on public scanner channels.
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