Product comparison · 2 smoke detectors

Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless vs Digicom 8D5785DA smoke detector Optical detector Wireless

12specifications compared
9differ
3identical
19known for one product only

Key differences

The Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless has 0.3 MHz more bandwidth than the Digicom 8D5785DA smoke detector Optical detector Wireless (868.3 MHz vs 868 MHz). The Digicom 8D5785DA smoke detector Optical detector Wireless has 5 dB more alarm decibels than the Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless (95 dB vs 90 dB). The Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless has 950 m more maximum range than the Digicom 8D5785DA smoke detector Optical detector Wireless (1000 m vs 50 m). Detector type: Photoelectrical reflection detector on the Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless, Optical detector on the Digicom 8D5785DA smoke detector Optical detector Wireless. Battery life: 3 year(s) on the Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless, 1 year(s) on the Digicom 8D5785DA smoke detector Optical detector Wireless.

Bandwidth
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:868.3 MHz
- 8D5785DA smoke detector Optical detector Wireless:868 MHz
Alarm decibels
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:90 dB
- 8D5785DA smoke detector Optical detector Wireless:95 dB
Maximum range
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:1000 m
- 8D5785DA smoke detector Optical detector Wireless:50 m
Battery life
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:3 year(s)
- 8D5785DA smoke detector Optical detector Wireless:1 year(s)
Compatible battery sizes
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:CR123A
- 8D5785DA smoke detector Optical detector Wireless:9v
Operating temperature (T-T)
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:-10 - 55 °C
- 8D5785DA smoke detector Optical detector Wireless:0 - 50 °C
Diameter
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:9.8 cm
- 8D5785DA smoke detector Optical detector Wireless:11 cm
Height
- HY-SA21A-W2 Photoelectrical reflection detector Wireless:43.1 mm
- 8D5785DA smoke detector Optical detector Wireless:32 mm

Side by side

Differences highlightedShow differences only

Comparison of HY-SA21A-W2, 8D5785DA
31 specifications	A Dahua Technology HY-SA21A-W2 Photoelectrical reflection detector Wireless Model HY-SA21A-W2 View product	B Digicom 8D5785DA smoke detector Optical detector Wireless Model 8D5785DA View product
Features4 differ
Detector typeDiffers	Photoelectrical reflection detector	Optical detector
BandwidthDiffers	868.3 MHz	868 MHz
Housing materialKnown for one	ABS	Unknown — not stated by the source
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 decibelsDiffers	90 dB	95 dB
Alarm muteKnown for one	Yes	Unknown — not stated by the source
Maximum rangeDiffers	1000 m	50 m
Test buttonKnown for one	Unknown — not stated by the source	Yes
Mounting typeKnown for one	Unknown — not stated by the source	Surface-mounted
Placement supportedKnown for one	Unknown — not stated by the source	Horizontal
Power2 differ
Input voltageKnown for one	3 V	Unknown — not stated by the source
Battery lifeDiffers	3 year(s)	1 year(s)
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 sizesDiffers	CR123A	9v
Battery voltageKnown for one	Unknown — not stated by the source	9 V
Number of batteries supportedKnown for one	Unknown — not stated by the source	1
Operational conditions1 differ
Operating temperature (T-T)Differs	-10 - 55 °C	0 - 50 °C
Operating relative humidity (H-H)Known for one	0 - 95%	Unknown — not stated by the source
Weight & dimensions2 differ
DiameterDiffers	9.8 cm	11 cm
HeightDiffers	43.1 mm	32 mm
WeightKnown for one	140 g	Unknown — not stated by the source
Batteryidentical
Battery technologyKnown for one	Lithium	Unknown — not stated by the source
Sustainabilityidentical
Compliance certificatesKnown for one	CE	Unknown — not stated by the source
Packaging dataidentical
Quantity per packKnown for one	Unknown — not stated by the source	1 pc(s)
Package typeKnown for one	Unknown — not stated by the source	Box

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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