Dahua DHI-ARD821-W2 Wireless Panic Button
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Vendor:
Dahua
Dahua DHI-ARD821-W2 Wireless Panic Button
SKU: DHI-ARD821-W2
Description
The Dahua DHI-ARD821-W2 is a wireless panic button for the Dahua AirShield alarm system. One press raises an immediate emergency alarm — useful for intrusion, fire, a medical scare or any moment you need help fast — and the alert goes to your AirShield hub and your phone. It is IP54 rated, runs on a coin cell and can be wall-mounted or carried, talking to the hub over an encrypted 868 MHz two-way link. An AirShield hub is required and sold separately.
Key points
- One-touch panic / SOS button raises an immediate emergency alarm
- 868 MHz two-way radio with AES128 encryption and frequency hopping
- Range up to 1,200 m in open space to the hub
- IP54 rated; multi-status LED with battery level in the app
- Accidental-press prevention to avoid false alerts
- CR2032 battery, around 3 years; wall-mount or portable; needs an AirShield hub
Delivery, warranty & returns · 3-year warranty · shipped from Australian stock
- Tracked delivery on every order. The tracking number is emailed as soon as it ships.
- Metro delivery: 2–4 business days. Regional areas may take longer. Free standard shipping over $300, flat $25 under.
- 3-year warranty on cameras and recorders, back-to-base, plus your Australian Consumer Law rights.
- 30-day returns on unopened items. Faulty on arrival? We cover return shipping.
- Genuine Australian stock. Never grey imports. Prices include GST.
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Dahua DHI-ARD821-W2 Wireless Panic Button
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All cameras, NVRs and DVRs come with a 3-year back-to-base manufacturer warranty covering defects in materials and workmanship, in addition to your rights under Australian Consumer Law. Hard drives and accessories are covered as set out in our Warranty Policy.
Standard shipping is free on all orders over $300 AUD, Australia-wide. Orders under $300 ship at a flat rate of $25, calculated at checkout. Tracking is included on every order.
You have 30 days from the day you receive your order to request a change-of-mind return. Items must be unopened, factory-sealed and in resalable condition. A 15% restocking fee applies and return postage is at your cost. Faulty or incorrectly supplied items are different: we cover the return shipping and refund or replace at no charge. Read the full Return & Refund Policy.
Metro delivery usually takes 2–4 business days after dispatch, and regional areas may take longer. You'll receive a tracking number by email as soon as your order leaves the warehouse.
01Overview
What the DHI-ARD821-W2 is
The Dahua DHI-ARD821-W2 is a single-button wireless panic button for the Dahua AirShield alarm system. Press it and it raises an immediate emergency alarm at the hub and on your phone — a fast way to call for help in an intrusion, fire, gas or medical situation, or simply a personal-safety alert for someone living alone. A multi-status LED shows pairing and signal, and you can read its battery level in the DMSS app.
It is built to be where you need it. The casing is IP54 rated against dust and splashes, it mounts on a wall by a bed or door, or clips to a keyring or bracket to carry, and it links to the hub over 868 MHz two-way radio with AES128 encryption and frequency hopping at up to 1,200 m in open space. Accidental-press prevention keeps a knock or a pocket from raising a false alarm.
Two honest notes: it is an accessory, not a complete alarm — it needs a Dahua AirShield hub to do anything, and you decide in the app what an SOS press does. If you want a version that needs two buttons pressed together to fire, look at the ARD822-W2. It runs on a CR2032 cell for around three years with a low-battery warning, and it is genuine Australian Dahua stock with local 3-year warranty and support.
02Engineering
DHI-ARD821-W2 specifications
- Single-button wireless panic / SOS button for the Dahua AirShield alarm system
- One press raises an immediate emergency alarm to the hub and your phone
- 868 MHz two-way communication with AES128 encryption and frequency hopping
- Range up to 1,200 m in open space to the AirShield hub
- IP54 rated casing; multi-status LED; battery level shown in the DMSS app
- Accidental-press prevention to avoid false alerts; cloud update
- CR2032 battery, around 3 years of life, with low-battery warning
- Wall-mount or portable (strap/bracket options); EN 50131 Security Grade 2; requires an AirShield hub
- One press raises an immediate emergency alarm to the hub and your phone
- 868 MHz two-way communication with AES128 encryption and frequency hopping
- Range up to 1,200 m in open space to the AirShield hub
- IP54 rated casing; multi-status LED; battery level shown in the DMSS app
- Accidental-press prevention to avoid false alerts; cloud update
- CR2032 battery, around 3 years of life, with low-battery warning
- Wall-mount or portable (strap/bracket options); EN 50131 Security Grade 2; requires an AirShield hub
03Full datasheet
Detailed specifications
Network & Storage
| Feature | Detail |
|---|---|
| Remote Update | Cloud update |
| Carrier Frequency | 868.0 MHz–868.6 MHz |
| Communication Distance | Up to 1,200 m (3937.01 ft) in an open space |
| Communication Mechanism | Two–way |
| Encryption Mode | AES128 |
| Frequency Hopping | Yes |
| Signal Strength | Yes |
Event & Alarm
| Feature | Detail |
|---|---|
| Low Battery Detection | Yes |
| Test Mode | Yes |
Interface
| Feature | Detail |
|---|---|
| Indicator Light | 1 for multiple statuses (pairing, communication, and more) |
| Button | 1 |
General & Environment
| Feature | Detail |
|---|---|
| Battery Model | CR2032 |
| Battery Life | 3 years (if used twice a week) |
| Battery Level Display | Displays battery level on app |
| Operating Current | 28 mA |
| Operating Temperature | –10 °C to +55 °C (+14 °F to +131 °F) (indoor) |
| Operating Humidity | 10%–90% (RH) |
| Product Dimensions | 55 mm × 36 mm × 14.2 mm (2.17" × 1.42" × 0.56") (L × W × H) |
| Packaging Dimensions | 95 mm × 59.5 mm × 30.5 mm (3.74" × 2.34" × 1.20") (L × W × H) |
| Installation | Wall mount; portable |
| Net Weight | 18 g (0.04 lb) |
| Gross Weight | 48 g (0.11 lb) |
| Casing Material | PC + ABS |
| Protection | IP54 |
| Certifications | CE; EN 50131-1:2006+A1:2009+A2:2017+A3:2020; EN 50131-3:2009; EN 50131-6:2017; EN 50131-5-3:2017; Security Grade 2; Environmental Class II |
| Network & Storage — Remote Update | Cloud update |
|---|---|
| Network & Storage — Carrier Frequency | 868.0 MHz–868.6 MHz |
| Network & Storage — Communication Distance | Up to 1,200 m (3937.01 ft) in an open space |
| Network & Storage — Communication Mechanism | Two–way |
| Network & Storage — Encryption Mode | AES128 |
| Network & Storage — Frequency Hopping | Yes |
| Network & Storage — Signal Strength | Yes |
| Event & Alarm — Low Battery Detection | Yes |
| Event & Alarm — Test Mode | Yes |
| Interface — Indicator Light | 1 for multiple statuses (pairing, communication, and more) |
| Interface — Button | 1 |
| General & Environment — Battery Model | CR2032 |
| General & Environment — Battery Life | 3 years (if used twice a week) |
| General & Environment — Battery Level Display | Displays battery level on app |
| General & Environment — Operating Current | 28 mA |
| General & Environment — Operating Temperature | –10 °C to +55 °C (+14 °F to +131 °F) (indoor) |
| General & Environment — Operating Humidity | 10%–90% (RH) |
| General & Environment — Product Dimensions | 55 mm × 36 mm × 14.2 mm (2.17" × 1.42" × 0.56") (L × W × H) |
| General & Environment — Packaging Dimensions | 95 mm × 59.5 mm × 30.5 mm (3.74" × 2.34" × 1.20") (L × W × H) |
| General & Environment — Installation | Wall mount; portable |
| General & Environment — Net Weight | 18 g (0.04 lb) |
| General & Environment — Gross Weight | 48 g (0.11 lb) |
| General & Environment — Casing Material | PC + ABS |
| General & Environment — Protection | IP54 |
| General & Environment — Certifications | CE; EN 50131-1:2006+A1:2009+A2:2017+A3:2020; EN 50131-3:2009; EN 50131-6:2017; EN 50131-5-3:2017; Security Grade 2; Environmental Class II |
04Why choose this
Built for the way you actually use the DHI-ARD821-W2
Where you need it
IP54 rated and small, it mounts by a bed or door or clips on to carry, so help is always within reach.
No false fires
Accidental-press prevention stops a knock or pocket from raising an alarm, while a real press still triggers easily.
Confirmed, secure link
868 MHz two-way radio with AES128 encryption and frequency hopping confirms each press and resists interference.
05Where it fits
Right at home in these scenarios
Personal safety at home
Keep one by the bed or carry it for a one-touch alarm, handy for elderly residents or anyone living alone.
Front counter or reception
Fit one under a shop counter or desk so staff can raise a discreet alarm during a hold-up or threat.
Medical and welfare alerts
Use it as a call-for-help button so a press brings family or the monitoring centre quickly.
Around the house and yard
Its IP54 rating lets you carry it to a patio, shed or pool area while staying in range of the hub.
06Setup
Installation & setup
-
01
What's in the box
One DHI-ARD821-W2 panic button with a CR2032 battery; strap or bracket mounting options depending on the variant. A Dahua AirShield hub is required and not included.
-
02
Installation requirements
Enrol it to your AirShield hub in the DMSS app, then decide in the app what an SOS press does and who is notified. Mount it on a wall where it is easy to reach or carry it, and test a press to confirm a good two-way signal before relying on it.
08Questions
Frequently asked about the DHI-ARD821-W2
Q.01
Does the ARD821-W2 work on its own?
No. It is a panic button for the Dahua AirShield system and needs an AirShield hub. The hub receives the SOS and decides what happens — sounding sirens, sending app, SMS or phone alerts — so on its own the button has nothing to signal.
Q.02
What happens when I press it?
It raises an immediate emergency alarm at the hub, which then alerts you and anyone else set up in the app, and can sound your sirens. You choose in DMSS whether the press is a silent or audible alarm and who gets notified.
Q.03
Can it be pressed by accident?
It is designed with accidental-press prevention so a brush or a knock in a pocket does not fire it, while a deliberate press still triggers easily. If you want a stricter two-button version, the ARD822-W2 needs both buttons pressed together.
Q.04
Is it weatherproof enough to use outside or by a pool?
It carries an IP54 rating, which resists dust and splashes — fine for a damp area, a patio or carrying outdoors, but it is not made to be submerged or left in driving rain like an outdoor siren.
Q.05
Can I carry it as well as mount it?
Yes. It can be fixed to a wall by a bed or door, or carried using strap or bracket options, so it works as both a fixed help button and a personal one you keep on you.
Q.06
How far can it be from the hub?
Up to 1,200 metres in open space. Through walls indoors the practical range is shorter, but it comfortably covers a normal home or small business where the button and hub are in or near the same building.
Q.07
How long does the battery last?
It runs on a single CR2032 coin cell for around three years in typical use, and the DMSS app shows its battery level so you get plenty of warning before a change is due.
Q.08
Is this genuine Australian Dahua stock?
Yes. It is the 868 MHz AirShield panic button supplied as genuine Australian Dahua stock with local 3-year warranty and support, matching the AirShield hubs and peripherals sold here.
Buying from Smarket
Is your Hikvision, Dahua, HiLook and TP-Link VIGI stock genuine Australian stock?
Yes, 100%. Every Hikvision, Dahua, HiLook and TP-Link VIGI product we sell is a genuine Australian-market model sourced through Australian supply chains — never grey imports. That means factory-sealed units, Australian-region firmware that works with the official apps out of the box, and a full 3-year local warranty.
How long does delivery take?
Metro delivery usually takes 2–4 business days after dispatch, and regional areas may take longer. You'll receive a tracking number by email as soon as your order leaves the warehouse.
How much is shipping?
Standard shipping is free on all orders over $300 AUD, Australia-wide. Orders under $300 ship at a flat rate of $25, calculated at checkout. Tracking is included on every order.
What warranty do you offer?
All cameras, NVRs and DVRs come with a 3-year back-to-base manufacturer warranty covering defects in materials and workmanship, in addition to your rights under Australian Consumer Law. Hard drives and accessories are covered as set out in our Warranty Policy.
What is your return policy?
You have 30 days from the day you receive your order to request a change-of-mind return. Items must be unopened, factory-sealed and in resalable condition. A 15% restocking fee applies and return postage is at your cost. Faulty or incorrectly supplied items are different: we cover the return shipping and refund or replace at no charge. Read the full Return & Refund Policy.
Do you offer installation?
We can connect you with licensed installers in Sydney and Melbourne. Installation typically starts from around $200 per camera depending on cable runs and site conditions. Email sales@smarket.com.au with your address and camera count for a quote.
10Bundles
Recommended packages
Pair it with an AirShield hub (required)
The button needs a hub to work — build your system on the DHI-ARC3800H-FW2 Alarm Hub 2, or the smaller DHI-ARC3000H-FW2 hub.
Prefer a two-button version?
For a button that needs both pressed together to fire, choose the ARD822-W2 dual panic button.
Make the alarm heard
Add an ARA12-W2 indoor siren indoors and an ARA13-W2 outdoor siren outside so an SOS is loud and obvious.
Build the rest of the system
Add detection with a ARD1233-W2 PIR detector and arming with the ARK30T-W2 keypad or ARA24-W2 keyfob.