Dahua DHI-ARD821-W2(868)-B - Wireless Panic Button
Product Features
- Dahua DHI-ARD821-W2(868)-B wireless panic button and emergency button for AirShield systems and intrusion, fire, gas and medical alarms.
- Offers accidental press prevention to reduce unintended alarms.
- 868MHz two-way wireless, AES128, frequency hopping, up to 1,200 m in open space.
- CR2032 battery rated for 3 years at twice a week use, with low battery detection.
Dahua DHI-ARD821-W2(868)-B — Wireless Panic Button
The Dahua DHI-ARD821-W2(868)-B is a wireless panic button and emergency button from Dahua's AirShield alarm range, not a motion detector. Dahua's DHI-ARD821-W2(868) panic button can trigger alarms for intrusions, fire, gas leaks and more, and can notify the monitoring centre and your loved ones that medical aid is needed. It offers accidental press prevention, runs on a CR2032 battery and talks to the alarm hub over two-way 868MHz wireless, up to 1,200 m in open space.
Also listed as ARD821-W2(868)-B.
Key features
- Wireless panic button for intrusion, fire, gas leak and medical alarms.
- Accidental press prevention, to reduce unintended alarms.
- 868MHz two-way RF communication with AES128 encryption and frequency hopping, up to 1,200 m in an open space.
- Multiple LED colours indicate different statuses, such as pairing and communication.
- Low battery detection, with the battery level shown in the app; CR2032 battery rated for 3 years at twice a week use.
- IP54, 55 mm × 36 mm × 14.2 mm and 18 g, for wall mount or portable use (indoor).
- Cloud update with automatic recovery from update failure.
Technical specification
| Model | DHI-ARD821-W2(868)-B (Dahua datasheet model: DHI-ARD821-W2(868), Wireless Panic Button) |
|---|---|
| Product type | Wireless panic button |
| Button | 1 |
| Indicator light | 1, for multiple statuses (pairing, communication and more) |
| Signal strength | Yes |
| Low battery detection | Yes |
| Battery level display | Displays battery level on app |
| Remote update | Cloud update |
| Carrier frequency | 868.0 MHz-868.6 MHz |
| Communication mechanism | Two-way |
| Communication distance | Up to 1,200 m (3937.01 ft) in an open space |
| Encryption mode | AES128 |
| Frequency hopping | Yes |
| Battery model | CR2032 |
| Battery life | 3 years (if used twice a week) |
| Operating current | 28 mA |
| Test mode | Yes |
| Operating temperature | -10 °C to +55 °C (+14 °F to +131 °F) (indoor) |
| Operating humidity | 10%-90% (RH) |
| Protection | IP54 |
| Product dimensions | 55 mm × 36 mm × 14.2 mm (L × W × H) |
| Net weight | 18 g (0.04 lb) |
| Installation | Wall mount; portable |
| Casing material | PC + ABS |
| Certifications | CE; EN 50131-1, EN 50131-3, EN 50131-6, EN 50131-5-3; Security Grade 2; Environmental Class II |
Works with
Dahua's application diagram shows the panic button connected to an alarm hub over RF868, so it needs a compatible Dahua 868MHz alarm hub; ask us to check compatibility before you order. Related products we stock:
- Dahua DHI-ARC3800H-FW2(868) 4G wireless alarm hub
- Dahua DHI-ARD822-W2(868) wireless panic button
- Dahua DHI-ARM7011-W2(868) wireless control module
- Dahua DHI-ARM7012-W2(868) wireless security relay module
- Dahua DHI-ART-ARC3000H-03-GW2(868) AirShield wireless security alarm kit
Common questions
What does a wireless panic button do?
Dahua says it supports multiple types of alarm for a wide variety of scenarios, triggering alarms for intrusions, fire, gas leaks and more, and it can be used to notify the monitoring centre and your loved ones that you need medical aid.
What is accidental press prevention?
Dahua lists it as a feature of this panic button. It is intended to reduce unintended alarms.
How long does the battery last?
It uses a CR2032 battery, rated by Dahua for 3 years if the button is used twice a week. The battery level shows in the app and the button reports low battery.
How far does the wireless signal reach?
Up to 1,200 m in an open space, using two-way 868MHz communication with AES128 encryption and frequency hopping.
Does it need an alarm hub?
Yes. Dahua's application diagram shows the panic button linked to an alarm hub over RF868.
What does the -B in the model mean?
Dahua lists DHI-ARD821-W2(868) with three versions: the panic button, the panic button with straps and the panic button with bracket. Its datasheet does not define the -B suffix, so call us on 01902 902251 if you need a particular fitting before ordering.
Browse the full Dahua range or contact us on 01902 902251.
Supplied by Zenith Security Co, Wolverhampton. We deliver to England, Scotland and Wales, or you can collect from our Wolverhampton trade counter (please call first).
Browse the range: Dahua AirShield alarms · Dahua cameras.
| Product Code | DHI-ARD821-W2(868)-B |
|---|---|
| Brand | Dahua |
| Product Type | Intruder & Smoke Alarm |
RELATED PRODUCTS
TECHNICAL SUPPORT
We provide tailored support for you and your CCTV system.
3 YEAR WARRANTY
Many of our Cameras and Recorders come with a comprehensive 3 year warranty.
COME & VISIT US
We've got a fully functioning show room and IP suite to show you exactly how our CCTV equipment works
FREE DELIVERY OVER £ 499
As cheap as £10, orders placed before 2:30pm are dispatched for delivery within 1–2 working days!
