Product comparison · 2 smoke detectors

Dahua Technology DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired vs Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless

Key differences

Connectivity technology
- DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired:Wired
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:Wireless
LED indicators
- DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired:Yes
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:Alarm, Fault, Power
Alarm decibels
- DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired:84 dB
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:90 dB
Battery life
- DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired:10 year(s)
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:3 year(s)
Diameter
- DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired:8.15 cm
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:9.8 cm
Height
- DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired:51.6 mm
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:43.1 mm
Weight
- DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired:110 g
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:140 g

Differences highlightedShow differences only

Comparison of DHI-HY-SA40A, HY-SA21A-W2
25 specifications	A Dahua Technology DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired Model DHI-HY-SA40A View product	B Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless Model HY-SA21A-W2 View product
Features3 differ
Connectivity technologyDiffers	Wired	Wireless
BandwidthKnown for one	Unknown — not stated by the source	868.3 MHz
Housing materialKnown for one	Unknown — not stated by the source	ABS
LED indicatorsDiffers	Yes	Alarm, Fault, Power
Alarm decibelsDiffers	84 dB	90 dB
Alarm muteKnown for one	Unknown — not stated by the source	Yes
Maximum rangeKnown for one	Unknown — not stated by the source	1000 m
Power1 differ
Input voltageKnown for one	Unknown — not stated by the source	3 V
Battery lifeDiffers	10 year(s)	3 year(s)
Battery low indicationKnown for one	Unknown — not stated by the source	Yes
Compatible battery sizesKnown for one	Unknown — not stated by the source	CR123A
Number of batteries supportedKnown for one	1	Unknown — not stated by the source
Operational conditionsidentical
Operating relative humidity (H-H)Known for one	Unknown — not stated by the source	0 - 95%
Weight & dimensions3 differ
DiameterDiffers	8.15 cm	9.8 cm
HeightDiffers	51.6 mm	43.1 mm
WeightDiffers	110 g	140 g
Sustainabilityidentical
Compliance certificatesKnown for one	Unknown — not stated by the source	CE

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.