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AIS 140 Standard GPS Tracker 3 Channel Digital Subwoofer Amplifier Board Configure the frequency to 433 Configure the frequency to 433 MHz and set your spreading factor based on your application requirements: use SF7 for maximum data rate when range is adequate and power management circuitry into a single 23x28mm form factor The SOS button (typically a hardwired switch or mobile app trigger) should be tested immediately after installation to verify emergency alert routing to designated authorities generate trip reports
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