Product comparison · 2 smoke detectors

Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless vs Dahua Technology DHI-HY-SA40A-R8 smoke detector Interconnectable Wired

9specifications compared
4differ
5identical
21known for one product only

Key differences

The Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless has 30 g more weight than the Dahua Technology DHI-HY-SA40A-R8 smoke detector Interconnectable Wired (140 g vs 110 g). Only the Dahua Technology DHI-HY-SA40A-R8 smoke detector Interconnectable Wired has interconnectable. Connectivity technology: Wireless on the Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless, Wired on the Dahua Technology DHI-HY-SA40A-R8 smoke detector Interconnectable Wired. Battery technology: Lithium on the Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless, Lithium-Ion (Li-Ion) on the Dahua Technology DHI-HY-SA40A-R8 smoke detector Interconnectable Wired.

Interconnectable
- DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless:No
- DHI-HY-SA40A-R8 smoke detector Interconnectable Wired:Yes
Connectivity technology
- DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless:Wireless
- DHI-HY-SA40A-R8 smoke detector Interconnectable Wired:Wired
Weight
- DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless:140 g
- DHI-HY-SA40A-R8 smoke detector Interconnectable Wired:110 g
Battery technology
- DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless:Lithium
- DHI-HY-SA40A-R8 smoke detector Interconnectable Wired:Lithium-Ion (Li-Ion)

Side by side

Differences highlightedShow differences only

Comparison of DHI-HY-SA21A-W2(868), DHI-HY-SA40A-R8
30 specifications	A Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless Model DHI-HY-SA21A-W2(868) View product	B Dahua Technology DHI-HY-SA40A-R8 smoke detector Interconnectable Wired Model DHI-HY-SA40A-R8 View product
Features2 differ
Detector typeKnown for one	Photoelectrical reflection detector	Unknown — not stated by the source
InterconnectableDiffers	No	Yes
Connectivity technologyDiffers	Wireless	Wired
BandwidthKnown for one	868.3 MHz	Unknown — not stated by the source
Housing material	ABS	ABS
Product colour	White	White
Suitable for indoor useKnown for one	Yes	Unknown — not stated by the source
Light alarmKnown for one	Yes	Unknown — not stated by the source
LED indicatorsKnown for one	Alarm, Fault, Power	Unknown — not stated by the source
Alarm decibelsKnown for one	90 dB	Unknown — not stated by the source
Alarm muteKnown for one	Yes	Unknown — not stated by the source
Maximum rangeKnown for one	1000 m	Unknown — not stated by the source
Mounting typeKnown for one	Surface-mounted	Unknown — not stated by the source
Poweridentical
Power source	Battery	Battery
Input voltageKnown for one	3 V	Unknown — not stated by the source
Battery lifeKnown for one	3 year(s)	Unknown — not stated by the source
Battery low indicationKnown for one	Yes	Unknown — not stated by the source
Battery typeKnown for one	CR123A	Unknown — not stated by the source
Compatible battery sizesKnown for one	CR123A	Unknown — not stated by the source
Battery voltageKnown for one	Unknown — not stated by the source	3 V
Operational conditionsidentical
Operating temperature (T-T)	-10 - 55 °C	-10 - 55 °C
Operating relative humidity (H-H)	0 - 95%	0 - 95%
Certificatesidentical
CertificationKnown for one	EN 14604:2005+AC:2008	Unknown — not stated by the source
Weight & dimensions1 differ
DiameterKnown for one	9.8 cm	Unknown — not stated by the source
HeightKnown for one	43.1 mm	Unknown — not stated by the source
WeightDiffers	140 g	110 g
WidthKnown for one	Unknown — not stated by the source	81.5 mm
DepthKnown for one	Unknown — not stated by the source	51.6 mm
Battery1 differ
Battery technologyDiffers	Lithium	Lithium-Ion (Li-Ion)
Sustainabilityidentical
Compliance certificatesKnown for one	CE	Unknown — not stated by the source

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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