Opto Acoustic Alarm

The Innovative Siren with LEDs

Powerful, flexible & configurable
Built on cutting-edge technology, the O2A signal device delivers sound levels exceeding 100 dB – all while maintaining exceptionally low power consumption. With a wide range of configuration options, it can be tailored precisely to meet individual application needs. More than just a signal emitter, the O2A is designed for seamless integration into complex, automated, or centrally managed systems. When paired with external sensors, it can dynamically respond to environmental changes in real time. Multiple models within the O2A product family offer flexible performance-to-cost options, making it a perfect fit for a broad range of use cases.

For any Use Case

One Solution

Adjustable
Volume and tone, as well as brightness, flash pattern, and flash duration, can all be individually configured.
Chaining
Chaining multiple devices enables the implementation of advanced applications.
Integration
The signal device can operate both autonomously and as part of existing systems.
Compliant
Complies with EN54-3 and EN54-23 standards, and meets EMC, CE, and RoHS requirements.
Smart Integration – Ready for Any Scenario
The O2A signal device can sense its environment using basic sensor inputs and respond autonomously to changing conditions—by triggering alarms or controlling connected devices. Its well-designed interface not only supports external sensors but also allows multiple O2A units to be daisy-chained. This creates intelligent device clusters where each unit can share status information and respond collaboratively. What starts as a simple siren becomes a smart, distributed solution—capable of adapting to a wide range of field applications, with or without a centralized control system.
Secure Power Supply in Case of Power Loss
The integrated energy storage ensures that the signal device remains operational even during power interruptions. Two storage options are available: a replaceable battery with a typical lifespan of 3 to 5 years, capable of powering multiple alert cycles, or a built-in supercapacitor (SuperCAP) with a service life of over 12 years, designed for single alert cycles lasting 4 to 6 minutes per charge. Charging times can be flexibly configured based on the available input current, allowing seamless adaptation to various power supply conditions.
Logging, Maintenance & Dynamic Configuration
Both installers and system operators can reconfigure the device and access logs or protocol data even after initial deployment. Communication with the O2A unit is possible through multiple interfaces. When multiple devices are connected in a daisy-chain, all configuration and data access can be handled centrally through a single unit. Robust security protocols ensure protection against unauthorized access. In addition, devices within a network can dynamically coordinate and adjust their configurations in real time—such as automatically synchronizing volume levels, light intensity, or LED colors based on the situation.

Many Functions

Powered by STM32 & ESP32 µControllers

32 Tones and More
There are 32 predefined tones to choose from. New tones can also be defined.​  Open link
Red LEDs
Thanks to the special optically clear cover over the LEDs, wide LED light beam angle is achieved.  Open link
RGBW Lighting
The LEDs allow light of any color and brightness. In white, they achieve up to 415 lumens.  Open link
Extensions
Modules extend the integration capabilities of O2A devices for many applications.  Open link
NFC-Interface
Each O2A-Siren can be configured quickly and easily via the wireless connection.  Open link
Access and security
Thanks to a specially developed protocol, communication offers excellent security.  Open link
Logging
Various events are saved and can be analyzed later.  Open link
Current Limit
A current limiter ensures safe use on external systems.  Open link
External Power
If required, an additional supply can be connected to support the chained system.  Open link
Switch / Button
Individual functions can be controlled using the optional button.  Open link
Internal Power
An internal energy storage enables power-free signaling and communication.  Open link
Protection
The internal circuit protects the device from short circuits or over voltages.  Open link

Enhanced connectivity with the optional WiFi module​

With the optional WiFi module, the O2A signal device can be seamlessly integrated into local networks—enabling remote control, data access, and integration into existing smart home and automation platforms such as Home Assistant. The module is powered by a high-performance ESP32-S3 chip and supports ESPHome as well as other specialized firmware versions depending on application needs. Communication is handled via the TCP/IP protocol with SSL/TLS encryption to ensure secure data transmission. Direct integration with smart home hubs is supported through socket connections, and a password-protected Swagger interface provides live API documentation and testing capabilities—ideal for dynamic environments. With the WiFi module, the O2A becomes a highly versatile and network-ready component, perfectly suited for modern distributed system architectures.​

For Every Situation

The Right Model

O2A Lite

The efficient Siren

32 Tones and More
Red LEDs
Communication
NFC-Interface

O2A SuperCAP

With Internal Energy Cells

32 Tones and More
Red LEDs
Communication
NFC-Interface
Switch / Button
Internal SuperCAP Cells

O2A Basic

The All-rounder

32 Tones and More
Red LEDs
Communication
NFC-Interface
Switch / Button
External Power
Extensions
Host Capabilities
White LEDs

O2A Pro

The smart solution

32 Tones and More
Red LEDs
Communication
NFC-Interface
Switch / Button
External Power
Extensions
Host Capabilities
White LEDs
RGB LEDs
Lit-Ion Battery
Bridge / Repeater

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