The Dahua DHI-ARA12-W2 is a wireless indoor siren designed to audibly alert users when a security alarm is triggered. With a powerful 105dB output and built-in tamper detection, it enhances any smart alarm system. Featuring real-time temperature readings, low battery alerts, and stable communication through two-way frequency-hopping transmission, this siren is ideal for enhancing intruder deterrence in homes and businesses alike.
Key Features
-
105dB Audible Alarm - Delivers a loud and attention-grabbing sound to deter intruders and alert occupants.
-
Wireless Design with 800m Range - Installs easily and communicates reliably up to 800 meters in open spaces.
-
Two-Way Frequency Hopping - Maintains stable, secure communication using encrypted AES128 signals.
-
Real-Time Temperature Sensor - Measures indoor temperature with ±1°C accuracy for added safety monitoring.
-
Battery Powered with 2.5-Year Life - Runs on two CR123A batteries—no wires or power outlets required.
-
Tamper Alarm Protection - Alerts users if someone attempts to remove or disable the siren.
-
App Connectivity & Signal Testing - Supports signal strength detection and works with the DMSS app for remote monitoring.
-
Cloud Firmware Updates - Keeps the device updated automatically with fallback protection if an update fails.
Perfect For:
- Home entrances and hallways
- Small business shops and offices
- Apartment interiors
- Rental properties and Airbnbs
- Villa or gated community security systems
- Indoor panic zones or utility areas
Install Tips
- Mount the siren in a central hallway or near entry points for maximum impact.
- Use bracket mount on a flat indoor wall or ceiling for optimal acoustic spread.
- Position away from sound-absorbing materials like curtains or soft furniture.
- Pair it with Dahua’s alarm hub and DMSS app for full integration and remote alert control.
- Regularly check the battery status via the DMSS app to ensure uninterrupted operation.
- Test the signal strength at the intended install location before final mounting.
Downloads
Quick-Read Specs Card
| Feature |
Details |
| Alarm Volume |
≥ 105 ± 3 dB @ 1 m |
| Communication Range |
Up to 800 m (open space) |
| Wireless Frequency |
433.1–434.6 MHz |
| Battery Life |
Up to 2.5 years |
| Power Supply |
2 × CR123A lithium batteries |
| Temperature Sensor |
Yes (±1 °C accuracy) |
| Tamper Protection |
Yes |
| Audio Control |
3 volume levels |
| Dimensions |
81 × 81 × 26 mm |
| Operating Temp |
–10 °C to +55 °C |
| Certifications |
CE |
| Mounting Type |
Bracket mount (indoor) |
Extra Info
Powerful Indoor Alerting
With a 105dB alarm output, the ARA12-W2 provides immediate audible alerts in the event of intrusion or danger. This loud siren is ideal for waking residents or deterring trespassers.
Smart Temperature Monitoring
Built-in temperature sensing offers accurate ambient readings with ±1°C precision, giving users additional environmental awareness alongside standard alarm functions.
Reliable Wireless Performance
Operating on 433 MHz with AES128 encryption and two-way communication, the siren ensures consistent and secure alarm signaling—especially useful for large homes or complex installations.
Battery-Powered Convenience
The included CR123A batteries provide up to 2.5 years of operation (based on two triggers per week), making this device maintenance-light and installation-friendly.
Auto Updates via Cloud
Stay current with cloud-based firmware updates that apply automatically. Even if an update fails, the device automatically rolls back, ensuring continuous operation.
Volume Adjustment
Three selectable volume levels allow customization based on the room size or location without compromising the core alarm effectiveness.
Q&A
Q: How loud is the siren?
A: It produces a powerful alarm of over 105 decibels—loud enough to alert or scare off intruders indoors.
Q: Can I adjust the volume?
A: Yes, there are 3 selectable volume levels to suit different installation areas.
Q: Does it detect temperature?
A: Yes, it has a built-in temperature sensor with ±1°C precision, viewable through the DMSS app.
Q: How long do the batteries last?
A: With normal use, the two CR123A batteries can last up to 2.5 years.
Q: Will I get notified if the battery is low?
A: Yes, the siren sends a low battery alert when replacement is needed.
Q: What happens if someone tries to remove or damage the siren?
A: The built-in tamper alarm will trigger, alerting you immediately.
Q: Does this work without Wi-Fi?
A: Yes, it uses RF433 communication with the alarm hub, not Wi-Fi. However, DMSS app alerts require an internet connection via the alarm system.
Q: How do I update the firmware?
A: Updates are performed automatically via cloud. The device also auto-recovers if the update process fails.
