SKU: 88075100913

DAHUA HY-SA21A-W2(868) Wireless Smoke Alarm

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Description

DAHUA HY-SA21A-W2(868) Wireless Smoke AlarmHY SA21A W2(868) 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

HY-SA21A-W2(868)

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

φ98mm × H43.1mm (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

868 MHz–868.3 MHz

Communication Distance

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

Communication Mechanism

Two-way

Frequency Hopping

Yes

Encryption Mode

AES128
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Exchange/Return Notes
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SKU: 88075100913

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4.9 ★★★★★
Based on 1434 reviews
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Product Reviews
W
Verified Purchase
What a reader
Charlottesville, US
★★★★★ 5
Excellent resource for couples
Format: Kindle
Good book! Chapters are short, to the point, and practical. My wife and I read this together and were blessed by it. You and Me Forever is unlike other marriage books. Couples are taught to live together on mission making God's will their highest priority - not their own personal happiness or security. It's taught that while marriage and family are wonderful things, good things can become an idol. The Chans seek to help people gain a biblical perspective on marriage and family, and they do a great job. Like other books from Francis Chan, arguments made are simple, easy to understand and backed up with scripture. Chapters are mostly written by Francis and Lisa together, though they do contain a section written exclusively by Lisa (my wife especially connected with these). Chapters close with meaningful reflection questions that couples should take advantage of - doing so blessed my marriage and they can yours too. If you enjoyed the book Crazy Love or simply want to read an excellent book for Christian couples, this is a good one. I'm recommending everyone at my church pick it up.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 28, 2014
L
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L-Dub
New York, US
★★★★★ 5
amazing! I wish I had read this marriage book ...
Format: Paperback
Ok...amazing! I wish I had read this marriage book about 9 years and 20 marriage books ago! This book changed the way I viewed EVERYTHING. I saw some reviewers mention they read Crazy Love by Francis Chan first which is what drew them to this, so I'm doing the opposite. I loved this one SO much I am going to read Crazy Love next! I've handed my copy off to a friend and I've recommended to many others. Everyone who has read it has told me they've been spreading the word. It was eye-opening for me as a wife and mother, to realize that living a Christian life is MUCH much more than having a happy family. My kids are still toddlers and I'm SO thankful for having read this book now so that we can truly center our marriage and family around Christ and show our children that living the authentic Christian life is more than just trying to be a perfect family. The book dives into much more, but that parenting chapter towards the end really hit me hard! (In a good way!!). I can't say enough for how genuinely inspirational this whole book was! It's one I couldn't put down and I can't wait to get it back so I can read it again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 17, 2015
W
Verified Purchase
Will
Port Orchard, US
★★★★★ 4
For marriage or for life?
Format: Paperback
My fiancé and I bought this book through the recommendation of a friend. We really enjoyed going through this book together as Mr. and Mrs. Chan discuss the importance of Christianity not only in marriage but also in our day to day lifestyles. Before starting "You and Me Forever," my fiancé and I had recently finished "The Meaning of Marriage" by Tim Keller, which I would highly recommend anyone who is interested in getting a fundamental view on marriage in the light of the gospel. Both books are similar in the aspect of this topic, however, "You and Me Forever" was a great book to read because it was not a overly saturated religious book about marriage. This book really challenges the readers to live to not only think of marriage in the light of the gospel but also their daily lives. So many marriage books are just that, marriage books. Do this, do that, and you will have a successful marriage. This book is unique in the sense of really pushing the reader to dig deeper in their spiritual life. Encouraging the growth in their heart rather than just biblically saturated "go to advice" for a better or stronger marriage. I would highly recommend this book to anyone, whether you are married, single, young or old. This book gives a great view of what your marriage, life, and heart should look like in the light of eternity!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 4, 2015
E
Verified Purchase
Elizabeth L Lano
Lake Worth, US
★★★★★ 5
Most important marriage book
Format: Paperback
This book is excellent and a must read for every Christian who’s married. This draws our attention off ourselves and even a “great marriage” and focuses our attention and eyes on CHRIST and the mission He gave us.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
K
Verified Purchase
KoNGo
Dallas, US
★★★★★ 5
It's a beautiful, God-exalting
Format: Hardcover
Still reading this with my wife and meeting up to go over the questions. It's a beautiful, God-exalting, Christ-centered view of marriage and how we are joined together for the mission of God, not just to stare at each other. An analogy that I always like to use (and I came up with one day randomly) was that my marriage is like a wedding cake. Sure, we bought the cake. Sure, we eat the first slice (and feed each other). But, if that cake doesn't get shared and enjoyed by the people around us, it's not serving it's purpose. In marriage, yes, we serve and love each other first, as is right, but if our marriage is only for us, then I believe we aren't using it the way God intended. I love Francis and Lisa Chan and this is a great book - not on how to have a great marriage, but how to view marriage in light of eternity and fuel us towards gospel-driven, God-honoring mission. We have only been married two years, but I see now that God is calling us to more, and we want to honor God in all that we do. I will recommend this book to others, but only once I finish the book. I'll update later with a more comprehensive review.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 13, 2015

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