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2026-04-29

Dahua Technology Releases 2025 ESG Report: Advancing Sustainable Development Through Digital Intelligence

HY-GC21B-W2(868)

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HY-GC21B-W2(868)

Wireless Carbon Monoxide Alarm

Key Points
    Overseas WisuAlarm Carbon monoxide alarm
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Datasheet

Specifications

Working Principle

Collection Type

Carbon Monoxide (CO)

Sensor Type

Electrochemical

Alarm

Alarm Type

CO alarm, fault warning, low battery warning

Alarm Volume

Over 85dB (A) at 3 m (9.84 ft)

Alarm Mode

Visual and audible alarm

Silence Function

Support

Silence Duration

About 45 seconds

Alarm Response Threshold

50 ppm: 60 min–90 min

100 ppm: 10 min–40 min

300 ppm: < 3 min

Wireless

Carrier Frequency

868 MHz

Communication Distance

Up to 1000 m (3280.84 ft) in an open space

Frequency Hopping

Yes

Encryption Mode

AES128

Basic Parameters

Display

LCD

Indicator Light

LED (red/yellow/green)

LED Instruction

Alarm: Red indicator
Fault: Yellow indicator
Power: Green indicator

Power Supply

Battery Life

3 years

Power Source

3V CR123A lithium battery (replaceable)

Operating Current

Monitoring Current: ≤20uA
Alarm Current: ≤10mA

Operating Ambient

Operating Environment

Indoor use only

Operating Temperature

–10°C to +40°C (+14°F to +104°F)

Operating Humidity

≤95% RH (non condensing)

Appearance

Color

White

Material

PC + ABS

Dimensions

116.4 mm × 71.7 mm × 28.3 mm (4.58" × 2.82" × 1.11")

Weight

125 g

Installation

Wall Mount

Certification

Certifications

TÜV and CE listed

Compliance Standard

EN 50291-1:2018, EN 50291-2:2019

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