MHPSS: Rapidly Deployable Outdoor Siren Trailer
High Power and Flexible Configuration:
The MHPSS is available in both 1600W and 3200W configurations, using up to eight 400W speakers to deliver powerful sound coverage over large areas. It supports up to 255 pre-recorded voice messages with a total recording capacity of up to 100 hours. Equipped with 10 pre-configured alert tones and live PA capabilities, the MHPSS is perfect for both routine public address and emergency notifications.
Durable and Portable Design:
The MHPSS is mounted on a rugged steel trailer, allowing for easy transport and setup in various environments. Its durable construction ensures reliable performance in extreme weather conditions, making it suitable for military installations, remote sites, construction zones, large public gatherings, and more.
Advanced Communication Options:
Supporting multiple communication channels, the MHPSS is compatible with UHF/VHF RF, Ethernet, Cellular, and Satellite connectivity. It can be remotely controlled and monitored using ATI’s Mobile REACT5000 or a central control station.
Superior Reliability and Security:
The system offers enhanced security with message encryption and security coding to prevent unauthorized activations. Automatic gain control maintains consistent volume output, while advanced diagnostic tools provide real-time monitoring and system health updates, enabling proactive maintenance and minimizing downtime.
Extended Battery Backup and Remote Charging:
Provides up to 7 days of standby time and 60 minutes of full-power operation. Optional solar charging available for remote and off-grid applications.




Environmental Characteristics
- Operating Temperature: -40°C to +60°C
- Humidity Tolerance: 0 to 95% non-condensing
Electrical Characteristics
- Supply Voltage: 120VAC 60Hz, 240VAC 50Hz
- Battery Backup: up to 4 x 12V 100AH
- Standby Time without AC: Over 7 days
- Activation Time: 60 minutes (steady tone, full power)
Communication Interfaces
- Communication Options: UHF/VHF RF, IP, Ethernet-over-Fiber, Telephone/Twisted DSL, Cellular, and Satellite
- Signaling Inputs/Outputs: 8 maximum (configurable)
Pre-recorded Messages/Tone Characteristics
- Alert Tones: 10 pre-configured alert tones
- Recorded Messages: Up to 255 messages
- Recording Time: Maximum of 100 hours (depends on recording content)
Amplifier Characteristics
- Speakers Supported: Up to 8 (400W speakers each)
- Number of Amplifiers: 2 1600W or 3200W Amplifiers
Security
- SSL/TLS security standards, including AES, RSA, 3DES, ARC4, SHA1, SHA2, MD2, MD4, and MD5
Deploy Giant Voice System in Minutes