Alarms and access prevention devices fall broadly into two main categories: The 'B' type bells-only alarm and the 'A' type monitored alarm. Both can be linked to Ip CCTV to ensure that there are effective images of the intruder .
The bells-only alarm – or audible-only alarm – emits a loud outside siren or bell blast when it is triggered. To be effective this relies on intruders being deterred by the noise, which may alert a neighbour or passer-by into calling the police.
‘A’ type monitored alarms are connected via a telephone line or radio network to a security station, which monitors signals received from the alarm 24 hours a day. If the detector is triggered then they typically phone your home and use a password identification system to check everything is OK. If this is not received then the police may be notified.
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