The DHI-ARD821-W2 is a compact wireless panic button designed to instantly alert monitoring centers or caregivers during emergencies. Whether it’s an intrusion, fire, gas leak, or medical crisis, this button delivers reliable, encrypted communication with visual LED feedback and accidental press prevention. Built for versatility and quick deployment, it’s ideal for personal safety across a range of indoor environments.
Key Features
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Multi-Scenario Emergency Support - Triggers immediate alerts for break-ins, fire, gas leaks, or medical emergencies — all from one device.
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Accidental Press Prevention - Features design safeguards to avoid unintentional triggering — especially useful in homes with children or cluttered spaces.
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Clear LED Status Feedback - Multi-color indicator provides real-time feedback for pairing, communication, and battery level.
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Two-Way Encrypted Communication - Uses AES128 encryption for secure, bidirectional data transfer with the hub.
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Cloud Updates with Auto Recovery - Supports over-the-air firmware updates, ensuring long-term reliability and fast recovery if an update fails.
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Flexible Mounting Options - Includes wall mount, strap, or bracket options for convenient access wherever it’s needed.
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Long-Lasting Battery Life - Powered by a CR2032 battery with up to 3 years of life for low-maintenance use.
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IP54 Weather Resistance - Withstands dust and splashes, allowing installation in a variety of indoor settings with moderate exposure.
Perfect For:
- Apartment bedrooms and bathrooms
- Villa entryways or bedside tables
- Retail store counters
- Office reception desks
- Clinics or elderly care facilities
- Staff or security checkpoints
Install Tips
- Mount near bedsides, desks, or entry doors where users can access it quickly during emergencies.
- Use the included strap or bracket for mobile users or elderly care scenarios.
- Enable test mode during setup to check communication and LED indicator functionality.
- Regularly check battery status via the app — alerts show if battery is low.
- Avoid placing in outdoor or direct wet environments despite IP54 rating.
- Pair securely with the alarm hub and verify two-way signal using the RF test function.
Downloads
Quick-Read Specs Card
| Spec |
Detail |
| Function |
Emergency alert trigger (intrusion, fire, gas, medical) |
| Communication Range |
Up to 800 m (2625 ft) open space |
| Communication Type |
Two-way, 433.1–434.6 MHz |
| Encryption |
AES128 |
| Frequency Hopping |
Yes |
| Battery Type |
CR2032 |
| Battery Life |
Up to 3 years (2 presses/week) |
| LED Feedback |
Multi-color status indicator |
| Installation |
Wall mount / bracket / strap / portable |
| IP Rating |
IP54 (dust/splash resistant) |
| Dimensions |
55 × 36 × 14.2 mm (2.17" × 1.42" × 0.56") |
| Net Weight |
18 g (0.04 lb) |
| Operating Temp |
–10 °C to +55 °C (indoor use) |
Extra Info
All-in-One Emergency Response Trigger
The DHI-ARD821-W2 isn’t just for burglar alarms — it supports various alert types including medical, gas leak, and fire. One press notifies the control hub, mobile app, and monitoring center in real time, ensuring help is on the way without delay.
Accidental Trigger Prevention
Its physical button structure includes protective design measures that help avoid false triggers — especially helpful in busy environments or when carried in a pocket or bag.
Signal Stability with Frequency Hopping
Operating on the 433 MHz band with automatic frequency hopping, the device avoids interference from nearby wireless devices, maintaining strong signal reliability.
Encrypted Communication for Peace of Mind
Data exchanged between the button and alarm hub is protected with AES128 encryption, ensuring commands can’t be spoofed or hijacked.
Minimal Maintenance with Long Battery Life
With efficient power usage and low activation frequency, the button can last up to 3 years on a single CR2032 battery, minimizing service calls.
Q&A
Q: What kinds of emergencies can this panic button trigger?
It supports alarms for intrusions, fires, gas leaks, and medical emergencies — based on how it's configured in your system.
Q: Is the button safe to carry around in a pocket or on a strap?
Yes. It has accidental press prevention features built in, so it’s safe for mobile or wearable use.
Q: How do I know if it's working?
The multi-color LED light provides feedback during pairing, communication, and when battery is low. Signal strength and battery level are also visible in the app.
Q: Can it still work if my Wi-Fi is down?
Yes. It communicates over RF with the hub and does not rely on Wi-Fi. However, cloud alerts or app notifications may be delayed if your hub isn’t online.
Q: How long will the battery last?
Up to 3 years with light use (e.g., two presses per week). You can monitor battery levels in the DMSS app.
Q: What does IP54 mean?
It means the button is dust protected and resistant to water splashes — ideal for indoor use in kitchens, bathrooms, or near entry doors.
Q: Can I use this with other Dahua security sensors or just standalone?
It integrates with the Dahua alarm ecosystem and pairs with compatible alarm hubs for full functionality and notifications.
Q: Is it compatible with third-party alarm systems?
It is designed primarily for Dahua alarm systems and should be paired with a Dahua-compatible hub for full functionality.
