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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SML
Waukegan, US
★★★★★ 5
Best sunscreen
Size: 3 Fl Oz (Pack of 1)
My favorite sunscreen. Been buying if for 2 years and still a great product. It goes on easily and does not make your skin greasy or sweaty. It does not cause breakouts either.
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Reviewed in the United States on May 7, 2026
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JD
Draper, US
★★★★★ 4
Some white cast
Size: 3 Fl Oz (Pack of 1)
Works well, but definitely leaves white cast. It did better for me than it did for my partner but it was hard to get this to rub in and lot look white on him. Smells decent. I will continue to use.
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Reviewed in the United States on June 7, 2026
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Panamaniac
New York, US
★★★★★ 5
Good Stuff
Size: 3 Fl Oz (Pack of 1)
I’ve used this for several years..,light and blocks the rays.
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Reviewed in the United States on June 5, 2026
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Kristen
Los Angeles, US
★★★★★ 5
Your makeup won't get ruined! ❤️
Size: 0.47 Ounce (Pack of 1)
I'm new to skincare and I didn't know we were supposed to wear sunscreen! 😱 Turns out it's arguably the most important step of skincare. First, I like the texture of this sunscreen. It's not greasy, it's velvety and smooth. It feels nice on my skin. I used this for the first time yesterday, and I just want those of you to know who are considering buying this, it applies well against makeup! That was one of my main concerns. I did my skincare with this sunscreen as a final step, then put on my makeup. The sunscreen acted as a primer, honestly, so I skipped primer. When I reapplied the sunscreen hours later, my makeup didn't smear! Instead I had a nice, healthy glow to my skin. I actually think it enhanced my makeup; my makeup seemed to last longer than usual. If you find yourself to be TOO glowy after a while, just apply a bit of translucent powder and your makeup will stretch even longer. Bonus: It fits nicely in your purse! Good for people like me with a million things they insist on carrying around.
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Reviewed in the United States on March 30, 2026
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Jeanette's Mom
Belleville, US
★★★★★ 5
Works well when properly applied
Size: 3 Fl Oz (Pack of 1)
I try to always buy the highest SPF that I can find. This one fits the bill. If you apply it thoroughly all over and then reapply every few hours, you shouldn't get burned. I've worn it to the water park numerous times now. I have very sensitive skin, and it's given me no issues. I even put it on my face, just being careful not to get too close to my eye area. Once it absorbs into your skin, it doesn't feel too sticky like some other sunscreens can. Just be aware that it will leave a white residue on your bathing suit if you get it on there, but I've always been able to wash it out and that's a small price to pay for proper sun protection!
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Reviewed in the United States on April 9, 2026

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