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Carbon Monoxide Alarm
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Product Overview
Key Specifications
Usage Scenarios
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GS853U-BLDR
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GS853U-BLDR
Carbon Monoxide Alarm
The GS853U-BLDR is a high-performance smart carbon monoxide alarm equipped with advanced Bluetooth connectivity and a clear digital display. Certified to BS EN 50291 standards, it provides precise and continuous monitoring of CO levels in your home. Powered by DC 3V plus AA alkaline batteries, it delivers a reliable 10-year lifespan.
Bullet Points
Smart Bluetooth Connectivity
Features built-in Bluetooth technology that allows for remote data transmission, diagnostics, and alarm muting via a mobile app when connected to a smart gateway.
Clear Digital Display
Equipped with an easy-to-read display screen that shows real-time carbon monoxide concentration levels and device status at a glance.
User-Friendly Testing
Incorporates a crescendo test feature where the alarm sound gradually increases during testing, preventing sudden loud shocks to the elderly or children.
Sleep Easy Mode
Intelligently designed to temporarily silence low battery and fault warning chirps during the night, ensuring a peaceful sleep without disruption.
Versatile Application
Ruggedly designed and certified for use not only in traditional homes but also on recreational vehicles (RVs) and ships.
Key Specifications
Power SupplyDC 3V + AA Alkaline Battery
Product Life10 Years
Wireless TechnologyBluetooth (BLE)
Alarm Volume85dB @ 3m
Dimension120mm x 73mm x 35.5mm
Compliance StandardBS EN 50291-1:2018, BS EN 50291-2:2019



















Usage Scenarios
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Living Room Safety
Ideal for living rooms with fireplaces or gas heaters, providing continuous monitoring and real-time display of CO levels.
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Mobile Protection
Certified for use in recreational vehicles and boats, ensuring reliable carbon monoxide detection wherever you travel.
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Smart Home Integration
Connects with your smart home gateway for remote monitoring and app-based control, bringing modern convenience to home safety.
Living Areas
RV & Marine
Smart Home
Why Siterwell

With over a decade of expertise in IoT and safety technology, Siterwell partners with businesses worldwide to create smarter, safer living environments.

Backed by strong R&D capability, global certifications, and a 56,000 m² production base, we deliver both innovation and reliable large-scale manufacturing.
From award-winning designs to proven global delivery across Asia, Europe, and the US, we focus on building long-term partnerships that drive mutual growth and success.

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