This range of high power electronic warning sirens has been designed to satisfy warning and notification requirements for:
- Military facilities - mass alerting.
- Industrial warning and evacuation.
- Large area warning systems for Civil Defense.
- Flood warning and Tsunami alert.
Based on a common control that incorporates communication and control interfaces for radio and landline, user programmable warning signal generation, live and digitally stored voice messages and self-test, the siren uses modular, Class D audio power amplifiers that can be sized to drive a modular loudspeaker array to provide a range of sound pressure levels from 106dB to 125dB at 30 meters.
In this way, a wide variety of applications are satisfied, from small installations that cover an effective radius of 300m to 2000m omni directional radiation. The same modular loudspeaker array can also be configured for a directional radiation pattern. Internal -Quiet Test- performs a complete full power test of the siren. The status report  can be read on the siren control panel or communicated to the control station.
Communication with the siren can be made using:
- Land - Mobile Narrow Band FM Radio in the VHF and UHF Bands.
- Microwave Spread Spectrum Frequency Hopping radio (License Free)
- Fiber Optic and 600 Ohm Landlines
- TCP/IP
- Parallel interfaces to DCS terminals. (such as Moscad)
The siren controller is fully autonomous with battery back up for at least seven (7) days  with no AC supply. Solar power can be used with or in place of AC. The siren control enclosure is dust and water proof to IP65 standard and can be supplied  in steel or stainless steel as required.
The loudspeaker array is 100% resistant to the effects of lightning and atmospheric corrosion.

- Input voltage (to battery charger) 180 - 275 VAC ±10 % 50-60Hz
- Operating voltage +48VDC
- Solar panels can be connected.
- Batteries 4 x 12V - 44Ah capacity subject to siren output power. Typically 30 minutes of full power operation from fully charged batteries.
- 7 days standby with 6 minutes of full power alarm.
- Two 120W Switching chargers at 27V.
- Charging characteristics: "automatic function" (Standard IU-characteristics.
- Each battery individually monitored.
- Option for AC - Full Load 48VDC Power Supply.
- Steel or Stainless Steel cabinet typically 80 x 60 x 25cm IP65. Other sizes as required.
- Siren speaker is a vertical Line Array using cast Aluminum horns and 1 inch compression drivers.
- Omni directional and directional sound radiation may be configured using the same  speaker components.
- Horns 2 to 24 depending on required Sound Pressure Level (dB SPL).
- Range of SPL for standard siren types is 106db to 125dB at 30m
- Operating temperature range in standard IP65 enclosure -20Ί C to + 60Ί C
- Special heated or thermally controlled enclosures available for specific climatic  conditions.
- Intrinsic lightning protection.

Electronic Siren Controller

- Signal generator with two independently programmable channels.
- Up to 16 USER programmable Alarm Signals. Signals may be mixed with digital stored voice messages.
- 8 minutes total voice storage memory on board. Voice files stored as PCM-CCITT 8 kHz � 8 bits mono
- These 8 minutes can be sectioned into multiple messages.
- Integrated RS232 input for radio modem connection. 1.200 to 115.200 bps selectable data rate.
- This radio connection incorporates an audio input with programmable (software) audio delay line for speech via radio from the control station
- Integrated RS485 input 1.200 to 115.200 bps selectable data rate. (For connection to remote up to 1.5 km).
- Integrated RTC and RS232 input for (optional) clock synchronization via GPS Modem.
- 600 Ohm balanced and isolated audio line input for connection a landline or to a remote control console.

8 Opto-Isolated inputs for functional control.

- Programmable by user with a wide selection of pre-defined triggers and delays for activation of:
1. Warning signals
2. Stored messages,
3. Live audio
4. START/STOP for motor siren simulation. (Relay control)
5. Quiet Test and report.
6. Other control output functions via four (4) relays
Four Opto-Isolated Monitor inputs.
- Programmable by user with a wide selection of pre-defined triggers and delays for automatic reporting of monitored inputs, such as:
o Door Open/Closed
o AC Power OK/Fail
o Pre-set temperature exceeded
o Water in cabinet
o Tilt of pole
o Fire Call Station
o An other digital input that can be connected

Alarm Activated Relay output

- N/O or N/C relay contacts which are activated while an alarm is activate. (E.g. to connect external strobe light).

4 Programmable Relay outputs

- Four N.O Relay contacts, programmable by user to close when an internal fault condition or monitor input status is detected by the controller such as:
1. Quiet Test Amplifier  or Driver failure
2. Any of the above monitor inputs
3. Other.
- These relays can also be programmed to close at certain times and for certain durations in accordance with precision Schedules programmed by the User

Modular Class D Power Amplifiers

- Dual channel amplifiers up to (8 pairs) fully programmable.
- Amplifiers incorporate thermal and over current current protection.
- Self healing short circuit protection.
- Fault conditions are monitored and recorded in memory for future evaluation.
- Convection or force air cooled as required.