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Dahua Airshield Series Wireless Smoke Detector White 40m Detection - DAHI9984

Description

The Dahua DHI-HY-SA21A-W2 is a battery-powered wireless smoke alarm designed to deliver fast, reliable smoke detection for residential environments. Featuring advanced split-spectrum photoelectric sensor technology, it minimizes false alarms while providing timely alerts via loud siren and real-time DMSS app notifications. 

Key Features

  • Photoelectric Split-Spectrum Sensor - for early and accurate smoke detection
  • Loud 85–90 dB Alarm - at 3 meters with both visual and audible notifications
  • Battery-Powered - with 3-year lithium battery (replaceable CR123A)
  • Smart LED Indicators - for standby, alarm, fault, and low battery states
  • DMSS App Integration - for real-time remote smoke alerts
  • Single Button Test/Silence Function - for user convenience
  • Surface-Mount Device (SMD) Circuit Board - for stable performance
  • Two-Way Encrypted Wireless Communication - with AES128 & frequency hopping
  • Easy Ceiling Mount Installation — no wiring required
  • Long Wireless Range - Up to 1000m (open space)

  

Perfect For:

  • Residential homes and villas
  • Apartments and condominiums
  • Small retail shops
  • Airbnbs or rental units
  • Utility or storage rooms
  • Small office environments

Install Tips

  • Mount the device on the ceiling in the center of rooms for optimal smoke detection coverage.
  • Avoid installing near fans, vents, or cooking appliances to reduce false alarms.
  • Ideal mounting height is on flat ceilings—do not place on sloped or wall surfaces.
  • Replace battery after 3 years or when low battery warning LED blinks red.
  • Pair the alarm with the DMSS app for remote notifications and enhanced monitoring.
  • Press and hold the button for testing functionality or silencing during false triggers.

Downloads

Datasheet DAHI9984_DHI-HY-SA21A-W2_datasheet
User Manual Users Manual_DHI-HY-SA21A-W2

 

Quick-Read Specs Card

Feature Details
Sensor Type Photoelectric
Alarm Volume 85–90dB @ 3 m
Alarm Types Smoke, fault, low battery
LED Indicators Red and green (multi-state)
Battery Life Up to 3 years (CR123A lithium)
Wireless Frequency 433.1–434.6 MHz
Communication Range Up to 1000 m (open space)
Mobile App DMSS (real-time alert support)
Installation Ceiling mount
Operating Temp -10°C to +55°C
Humidity ≤ 95% RH (non-condensing)
Certifications TÜV, CE, EN 14604:2005+AC:2008
Material ABS casing, white

Extra Info

Advanced Smoke Sensing

The DHI-HY-SA21A-W2 uses photoelectric detection technology to better sense slow-burning, smoldering fires, which are typically harder to detect. This increases the chances of early warning in typical residential and light commercial environments.

Wireless Communication & Reliability

The alarm operates on the 433 MHz frequency range with AES128 encryption, and it supports two-way communication with frequency hopping. This helps prevent signal interference and ensures reliable, long-range connectivity—up to 1000 meters in open spaces.

Real-Time Mobile Alerts

Integration with the DMSS app means users are notified instantly when smoke is detected—even if they're not home. This is crucial for remote property management or when protecting vulnerable residents.

Built-In Visual Indicators

Multicolor LED indicators let users know the device’s status at all times—from standby mode to low battery or alarm conditions—without needing to guess.

Test & Silence Button

With a single press, users can perform a routine test or silence the alarm for approximately 12 minutes—handy for false alarms caused by dust or cooking smoke.

Q&A

Q: Can this device send alerts to my phone?
A: Yes, it connects to the DMSS app for real-time push notifications.

Q: How loud is the smoke alarm siren?
A: It produces an audible alarm of 85–90 decibels at 3 meters—loud enough to wake sleeping occupants.

Q: How long does the battery last?
A: The included 3V CR123A battery can last up to 3 years under normal usage.

Q: Can I silence false alarms?
A: Yes, pressing the button will silence the alarm for about 12 minutes.

Q: Does it work with other brands' alarm systems?
A: This model is a standalone wireless smoke alarm, and integration depends on the system used. It works natively with Dahua’s DMSS app.

Q: What does the LED indicator mean?
A: A green flash every minute means standby; red flashes indicate alarm, fault, or low battery conditions.

Q: Is the alarm suitable for kitchens?
A: While it can be used in kitchens, placement should avoid areas near stovetops or vents to reduce false alarms.

Q: How far apart should I install multiple alarms?
A: Each unit covers around 20–40 m². For larger homes or spaces, multiple units should be spaced to ensure full coverage.

Product form

Dahua Airshield Series Wireless Smoke Detector White 40m Detection - DAHI9984

SKU: DHI-HY-SA21A-W2 Datasheet

$69.00 $63.00 Incl. GST

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    Description

    The Dahua DHI-HY-SA21A-W2 is a battery-powered wireless smoke alarm designed to deliver fast, reliable smoke detection for residential environments. Featuring advanced split-spectrum photoelectric sensor technology, it minimizes false alarms while providing timely alerts via loud siren and real-time DMSS app notifications. 

    Key Features

    • Photoelectric Split-Spectrum Sensor - for early and accurate smoke detection
    • Loud 85–90 dB Alarm - at 3 meters with both visual and audible notifications
    • Battery-Powered - with 3-year lithium battery (replaceable CR123A)
    • Smart LED Indicators - for standby, alarm, fault, and low battery states
    • DMSS App Integration - for real-time remote smoke alerts
    • Single Button Test/Silence Function - for user convenience
    • Surface-Mount Device (SMD) Circuit Board - for stable performance
    • Two-Way Encrypted Wireless Communication - with AES128 & frequency hopping
    • Easy Ceiling Mount Installation — no wiring required
    • Long Wireless Range - Up to 1000m (open space)

      

    Perfect For:

    • Residential homes and villas
    • Apartments and condominiums
    • Small retail shops
    • Airbnbs or rental units
    • Utility or storage rooms
    • Small office environments

    Install Tips

    • Mount the device on the ceiling in the center of rooms for optimal smoke detection coverage.
    • Avoid installing near fans, vents, or cooking appliances to reduce false alarms.
    • Ideal mounting height is on flat ceilings—do not place on sloped or wall surfaces.
    • Replace battery after 3 years or when low battery warning LED blinks red.
    • Pair the alarm with the DMSS app for remote notifications and enhanced monitoring.
    • Press and hold the button for testing functionality or silencing during false triggers.

    Downloads

    Datasheet DAHI9984_DHI-HY-SA21A-W2_datasheet
    User Manual Users Manual_DHI-HY-SA21A-W2

     

    Quick-Read Specs Card

    Feature Details
    Sensor Type Photoelectric
    Alarm Volume 85–90dB @ 3 m
    Alarm Types Smoke, fault, low battery
    LED Indicators Red and green (multi-state)
    Battery Life Up to 3 years (CR123A lithium)
    Wireless Frequency 433.1–434.6 MHz
    Communication Range Up to 1000 m (open space)
    Mobile App DMSS (real-time alert support)
    Installation Ceiling mount
    Operating Temp -10°C to +55°C
    Humidity ≤ 95% RH (non-condensing)
    Certifications TÜV, CE, EN 14604:2005+AC:2008
    Material ABS casing, white

    Extra Info

    Advanced Smoke Sensing

    The DHI-HY-SA21A-W2 uses photoelectric detection technology to better sense slow-burning, smoldering fires, which are typically harder to detect. This increases the chances of early warning in typical residential and light commercial environments.

    Wireless Communication & Reliability

    The alarm operates on the 433 MHz frequency range with AES128 encryption, and it supports two-way communication with frequency hopping. This helps prevent signal interference and ensures reliable, long-range connectivity—up to 1000 meters in open spaces.

    Real-Time Mobile Alerts

    Integration with the DMSS app means users are notified instantly when smoke is detected—even if they're not home. This is crucial for remote property management or when protecting vulnerable residents.

    Built-In Visual Indicators

    Multicolor LED indicators let users know the device’s status at all times—from standby mode to low battery or alarm conditions—without needing to guess.

    Test & Silence Button

    With a single press, users can perform a routine test or silence the alarm for approximately 12 minutes—handy for false alarms caused by dust or cooking smoke.

    Q&A

    Q: Can this device send alerts to my phone?
    A: Yes, it connects to the DMSS app for real-time push notifications.

    Q: How loud is the smoke alarm siren?
    A: It produces an audible alarm of 85–90 decibels at 3 meters—loud enough to wake sleeping occupants.

    Q: How long does the battery last?
    A: The included 3V CR123A battery can last up to 3 years under normal usage.

    Q: Can I silence false alarms?
    A: Yes, pressing the button will silence the alarm for about 12 minutes.

    Q: Does it work with other brands' alarm systems?
    A: This model is a standalone wireless smoke alarm, and integration depends on the system used. It works natively with Dahua’s DMSS app.

    Q: What does the LED indicator mean?
    A: A green flash every minute means standby; red flashes indicate alarm, fault, or low battery conditions.

    Q: Is the alarm suitable for kitchens?
    A: While it can be used in kitchens, placement should avoid areas near stovetops or vents to reduce false alarms.

    Q: How far apart should I install multiple alarms?
    A: Each unit covers around 20–40 m². For larger homes or spaces, multiple units should be spaced to ensure full coverage.

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