Posted on07/03/2019
Sonitron SMA-13 buzzer commonly faulty in Kelvin Hughes indoor VDR-A6 and outdoor VDR-A7 microphone
http://www.sonitron.be/site/epag.php?eid=4
Kelvin Hughes VDR-A7 Outdoor microphone easily found faulty as it was expose to weather and either water ingress into the microphone or sometimes it can be due to cable short circuit between the micropohnes.
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