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Product comparison · 2 smoke detectors

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

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  • 15specifications compared
  • 7differ
  • 8identical
  • 13known for one product only

Key differences

The Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless has 6 dB more alarm decibels than the Dahua Technology DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired (90 dB vs 84 dB). The Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless has 1.65 cm more diameter than the Dahua Technology DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired (9.8 cm vs 8.15 cm). The Dahua Technology DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired has 8.5 mm more height than the Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless (51.6 mm vs 43.1 mm). 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 smoke detector Photoelectrical reflection detector Wired. LED indicators: Alarm, Fault, Power on the Dahua Technology DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless, Yes on the Dahua Technology DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired.

  • Connectivity technology
    • Wireless
    • Wired
  • LED indicators
    • Alarm, Fault, Power
    • Yes
  • Alarm decibels
    • 90 dB
    • 84 dB
  • Battery life
    • 3 year(s)
    • 10 year(s)
  • Diameter
    • 9.8 cm
    • 8.15 cm
  • Height
    • 43.1 mm
    • 51.6 mm
  • Weight
    • 140 g
    • 110 g

Side by side

Differences highlightedShow differences only
28 specifications
A

Dahua Technology

DHI-HY-SA21A-W2(868) smoke detector Photoelectrical reflection detector Wireless

Model DHI-HY-SA21A-W2(868)

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B

Dahua Technology

DHI-HY-SA40A smoke detector Photoelectrical reflection detector Wired

Model DHI-HY-SA40A

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Features3 differ
Detector typePhotoelectrical reflection detectorPhotoelectrical reflection detector
InterconnectableKnown for oneNo
Connectivity technologyDiffersWirelessWired
BandwidthKnown for one868.3 MHz
Housing materialKnown for oneABS
Product colourWhiteWhite
Suitable for indoor useYesYes
Light alarmYesYes
LED indicatorsDiffersAlarm, Fault, PowerYes
Alarm decibelsDiffers90 dB84 dB
Alarm muteKnown for oneYes
Maximum rangeKnown for one1000 m
Mounting typeKnown for oneSurface-mounted
Power1 differ
Power sourceBatteryBattery
Input voltageKnown for one3 V
Battery lifeDiffers3 year(s)10 year(s)
Battery low indicationKnown for oneYes
Battery typeCR123ACR123A
Compatible battery sizesKnown for oneCR123A
Number of batteries supportedKnown for one1
Operational conditionsidentical
Operating temperature (T-T)-10 - 55 °C-10 - 55 °C
Operating relative humidity (H-H)Known for one0 - 95%
Certificatesidentical
CertificationKnown for oneEN 14604:2005+AC:2008
Weight & dimensions3 differ
DiameterDiffers9.8 cm8.15 cm
HeightDiffers43.1 mm51.6 mm
WeightDiffers140 g110 g
Batteryidentical
Battery technologyLithiumLithium
Sustainabilityidentical
Compliance certificatesKnown for oneCE

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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