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

Shipping Notes
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Exchange/Return Notes
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SKU: 88075100913

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Curtis Cairatti
Birmingham, US
★★★★★ 5
Two thumbs up
Format: Hardcover
Book was in great shape. Two knicks on the cover but other than that, it looked like a brand new book.
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Reviewed in the United States on August 3, 2018
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Bozeman, US
★★★★★ 1
came damaged
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the book came with the spine broken
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Reviewed in the United States on January 15, 2024
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SEO MYEONGJUNE
Louisville, US
★★★★★ 5
Excel
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Perfect explanation !!
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Kyle Williamson
Omaha, US
★★★★★ 5
In law there is always another way
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I finished this book having completed all but one course for my law degree. It is a goldmine of techniques and outlines the modus operandi of how Judges and Lawyers ideally operate.
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Lowell, US
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Good for 1Ls to know
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Very useful
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Reviewed in the United States on May 7, 2025

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