When the active alarm siren is sounding how long ?. That is, the alarm detects something and starts sounding the siren , how long the siren sounds ? can set the time is sounding the siren? Thank you.
When the active alarm siren is sounding how long ?. That is, the alarm detects something and starts sounding the siren , how long the siren sounds ? can set the time is sounding the siren? Thank you.