Dahua DHI-HY-SA21A-W2(868) - Wireless Smoke Alarm
Product Features
- Wireless photoelectric smoke alarm with split-spectrum sensing
- 85-90dB(A) audible alarm at 3m, visual + audible alert
- Two-way encrypted 868MHz wireless, up to 1000m range, AES128
- 3-year battery life on replaceable CR123A lithium battery
Dahua DHI-HY-SA21A-W2(868) — Wireless Smoke Alarm
The DHI-HY-SA21A-W2(868) is a wireless photoelectric smoke alarm using split-spectrum sensor technology, giving both a loud local alarm (85-90dB(A) at 3m) and a wireless alert back to a compatible Dahua AirShield hub over encrypted two-way 868MHz communication.
Who is it for?
Where a room or building needs smoke detection integrated into a Dahua AirShield wireless alarm system — rather than a standalone smoke alarm — this unit reports fire/smoke events to the hub for app, SMS or phone alerts, alongside its own local siren.
Key specification
| Sensor Type | Photoelectric, split-spectrum, 10s sampling period |
|---|---|
| Alarm Types | Smoke alarm, fault warning, low battery warning |
| Alarm Volume | 85–90dB(A) at 3m, visual + audible |
| Silence Function | Yes, approx. 12 minutes |
| Coverage Area | 20–40 m² per device (ceilings under 8m) |
| Wireless | 868–868.3 MHz, two-way, AES128 encryption, frequency hopping |
| Communication Range | Up to 1000m in open space |
| Power | 3V CR123A lithium battery (replaceable), 3-year battery life |
| Certifications | TÜV and CE listed, EN 14604:2005+AC:2008 |
| Dimensions / Weight | Ø98mm x H43.1mm, 140g |
What you will need
- A Dahua AirShield wireless alarm hub to pair the detector with
- A CR123A lithium battery (included in the unit's design, replaceable)
- Ceiling mounting per room, sized to the 20-40m² coverage area
Frequently asked questions
Does it sound an alarm on its own, or only alert the hub?
Both — it sounds its own 85-90dB(A) local alarm and reports wirelessly to the hub for app/SMS/phone alerts.
How long does the battery last?
Around 3 years on the replaceable CR123A lithium battery.
How much space does one detector cover?
20–40 m², for ceiling heights under 8m.
Browse the full Dahua range, contact us on 01902 902251, or visit our Wolverhampton trade counter.
| Product Code | DHI-HY-SA21A-W2(868) |
|---|---|
| Manufacturer | Dahua |
| Colour | Brown |
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