Internal Sounder (or basic external sounder). These sounders are powered solely from the Control Panel. This means that if the cable to the sounder is cut then that particular sounder will not operate. However if the sounder has had its tamper circuit connected then any other signalling devices will operate due to the tamper circuit being tripped. Internal sounders are a very good deterrent in that if an intruder does enter the property then an internal high volume sounder is very disorientating.
Self-activating Bell. SAB unlike the self contained bell box these units depend on the control panel for backup power The unit comprise one or more sounders (approx 115dB), and one or more strobe lights, a rechargeable battery circuitry to control the sounder functions. All these components are fitted into a strong watertight bell box. The bell box is fitted with one or more tamper switches to prevent the box being opened or removed from the wall. Self-contained sounders incorporate a bell cut-off timer (the law requires that the bell should be shut off after a maximum of 20 minutes, but note that the strobe light(s) is normally allowed to continue) and either static or flashing comfort LEDs
Self-contained Bell. SCB These units carry there own battery for backup the unit comprise one or more sounders (approx 115dB), and one or more strobe lights, a rechargeable battery circuitry to control the sounder functions. All these components are fitted into a strong watertight bell box. The bell box is fitted with one or more tamper switches to prevent the box being opened or removed from the wall. Self-contained sounders incorporate a bell cut-off timer (the law requires that the bell should be shut off after a maximum of 20 minutes, but note that the strobe light(s) is normally allowed to continue) and either static or flashing comfort LEDs.
