SKU: 46794538160

DAHUA HY-SA21A-W2 Wireless Smoke Alarm

Sale price$347747.40 Regular price$386386.00
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Description

DAHUA HY-SA21A-W2 Wireless Smoke AlarmHY SA21A W2 Wireless Smoke Alarm > Split spectrum sensor technology > Test and silence features in one single button > Loud sound output over 85 dB(A) at 3 meters > Low quiescent current consumption > Surface mount device (SMD) circuit board design > Low battery warning signal Product Data Working Principle Collection Type Smoke Sampling Period 10 s Sensor Type Photoelectric Alarm Alarm Type Smoke alarm, fault alarm, low battery warning Alarm Volume

HY-SA21A-W2

Wireless Smoke Alarm

> Split-spectrum sensor technology
> Test and silence features in one single button
> Loud sound output over 85 dB(A) at 3 meters
> Low quiescent current consumption
> Surface-mount device (SMD) circuit board design
> Low battery warning signal



Product Data

Working Principle

Collection Type

Smoke

Sampling Period

10 s

Sensor Type

Photoelectric

Alarm

Alarm Type

Smoke alarm, fault alarm, low battery warning

Alarm Volume

85dB–90dB(A) at 3 m (9.84 ft)

Alarm Mode

Visual and audible alarm

Silence Function

Yes

Silence Duration

About 12 min

Alarm Response Threshold

0.2 dB/m - 0.3 dB/m

Basic Parameters

Indicator Light

Red and green LED indicator

Led Instructions

Standby: Green indicator flashes once per minute
Alarm: Red indicator flashes once per second
Fault: Red indicator flashes once per minute

Low battery warning: Red indicator flashes once per minute

Coverage Area

When the height of the space is less than 8 m (3.28 ft), the protection area of a device is 20 m2–40 m2

Power Supply

Battery Life

3 year

Operating Voltage

3V CR123A lithium battery (replaceable)

Operating Current

Monitoring current: ≤ 35uA
Alarm current: ≤ 35mA

Operating Ambient

Operating Environment

Indoor

Operating Temperature

-10°C to +55°C (+14°F to +131°F)

Operating Humidity

≤ 95% RH (non condensing)

Appearance

Color

White

Casing

ABS

Dimensions

φ98 mm × H43.1 mm (φ3.85" × H1.70")

Weight

140 g (0.30 lb)

Installation

Ceiling Mount

Certifications

Certifications

TÜV and CE listed

Compliance Standard

EN 14604:2005+AC:2008

Wireless

Carrier Frequency

433.1 MHz–434.6 MHz

Communication Distance

Up to 1000 m (3280.84 ft) in an open space

Communication Mechanism

Two-way

Frequency Hopping

Yes

Encryption Mode

AES128

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 46794538160

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S
Shire23
West Palm Beach, US
★★★★★ 5
Great Replacement Cabin Air Filters for my 2008 Honda Civic
Size: 2Pcs, Size: 2Pcs
Item Reviewed: CF10134 Cabin Air Filter with Activated Carbon Replacement for CP134, Fit for Honda Accord/Civic/Odyssey/CR-V and Acura MDX/TSX/TLX/RDX/Ridgeline (2 pack) ℹ️ Summary I picked these up because I needed some replacement cabin air filters for my 2008 Honda Civic. These seem like decent quality and they were a perfect fit in my car. For $15 at time of order for two air filters it was a solid deal that I can glad recommend to others. I hate writing short reviews, but there’s not much else to say about these. Here is how I rate items: 5 ⭐️ = Completely exceeds expectations. 4 ⭐️ = Works well with minor concerns. 3 ⭐️ = Does the job, nothing special. 2 ⭐️ = Some things work, but lots of issues. 1 ⭐️ = Didn’t work well, not worth it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 30, 2025
T
TLau
Lexington, US
★★★★★ 4
Good fit for Acura MDX
Size: 8.8" x 9.3" x 1.1"
This is an air cabin filter that will fit many cars, and in my case a 2019 MDX. Since this kind of filter is not doing anything critical like keeping dirt out of an engine, I shop around for non-OEM filters for something that strikes a balance between price versus performance. This filter just filters out dust in a car cabin, and when we’re not in our cars, we don’t have the benefit of an air filter when we are walking around outdoors. At a fraction of the price of an Acura filter, this filter seems to strike that balance. The filter media looks sturdy and is embedded with charcoal to help absorb odors. Installation is very straightforward in my MDX, and similar in most cars. There is a compartment door inside the glovebox that first must be removed before changing the filter. Pay attention to the direction flow arrow that shows which way the filter should be installed. Overall I am satisfied with this filter. It is inexpensive, fits perfectly, and seems to do the job just fine. It is definitely worth trying if you are trying to save money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 12, 2024
S
Shop by Interest
Grantham, US
★★★★★ 5
These filters do the job
Size: 2Pcs
Fits great in my '08 Accord LX and my '19 Accord Sport 2.0t. They filter air well and are easy to install like any cabin air filter in a Honda. I am pleased. Good value for the price.
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Reviewed in the United States on October 8, 2025
L
Lars A. Morgan
Battle Creek, US
★★★★★ 5
Fit my 2014 Odyssey TE
Size: 8.8" x 9.3" x 1.1"
Comes with printed instructions for those who haven't changed it before. Here is the specific use case from my van. On my 2014 TE its easy to access behind the glove box, open to usual full open then just push the left and right sides in to allow the glove box to come fully out. It may pop off of the mounts, don't panic it snaps right back on. Then look for the little rectangular panel with two small levers on either side. on the black plastic under the dash that you can now see and access. Press the levers and pull towards you, doing a bit of a wiggle to get it out. Its tight, but it will come out with having to break it. Don't gorilla hands it, it will break. There is a directional arrow on the filter, which you have to remove from the wrapper before installing. Yes, someone *will* forget that. Reassembly the reverse of removal. Check that video sharing site online if you need visual instructions.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 27, 2024
Y
Verified Purchase
Yianni Tripodis
Lake Worth, US
★★★★★ 5
Price/Quality
Packaged very well, perfect fit and the quality looks great. Well worth the price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 11, 2026

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