Answer: Terminal 1 on the transmitter can be used to drive an external/additional siren. The terminal output goes to +12V and can deliver up to 1A when the MOBILE ALERT system is activated. This output will maintain at +12V for about 3 minutes and then will reset. Be sure to check the rating of the siren being used.
Note: Some localities have ordinances covering the use of sirens in a car; check your local ordinances before connecting a siren.
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