Smoke and Carbon Monoxide Detector Meross CS11-EU — Wi‑Fi, Battery‑Operated, Combined Smoke/CO Sensing

Meross CS11-EU is a compact combined smoke and carbon monoxide detector with built-in Wi‑Fi and a long‑life CR123A battery. The device integrates a photoelectric smoke sensor and an electrochemical CO sensor to detect both fire and dangerous levels of carbon monoxide in homes and apartments. Designed for simple, cable‑free installation, the detector provides audible alerts, status LEDs, and remote notifications over Wi‑Fi.

Advantages

The Meross CS11-EU meets EN14604 and EN50291 standards and delivers fast, reliable detection: it sounds an alarm in under 3 minutes at 300 ppm CO and produces a loud alert above 85 dB. Dual sensors reduce false alarms by distinguishing fast and slow‑burning fires and prioritizing smoke alerts before CO when both are present. The replaceable mounting bracket and long‑life 3V CR123A battery (up to about 10 years) enable quick installation without professional wiring. A three‑color LED and a single button make status checks, testing and muting simple.

Suitable for

• Homes and apartments
• Bedrooms and living rooms
• Kitchens (installed at recommended distances from cooking appliances)
• Garages and utility rooms where CO exposure risk exists

Key specifications

• Manufacturer: Meross
• Model: CS11‑EU
• Certifications: EN14604:2005/AC:2008, EN50291‑1:2018
• Smoke sensor: photoelectric (sensitivity 0.09–0.17 dB/m)
• CO sensor: electrochemical (50 ppm: 60–90 min; 100 ppm: 10–40 min; 300 ppm: <3 min)
• Power: CR123A 3 V lithium battery (1600 mAh, non‑replaceable)
• Standby current <30 μA; alarm current <70 mA
• Alarm volume: ≥85 dB(A) at 3 m
• Low battery threshold: 2.6 ± 0.1 V
• Mute time: approx. 10 min
• Operating temperature: −10 °C to 40 °C
• Operating humidity: 15–95% RH (no condensation)

How to use

Attach the supplied mounting bracket to the ceiling or wall using the included screws, then place the detector into the bracket until it clicks. Power is provided by the preinstalled CR123A battery; no wiring is required. Use the single button to perform a test or to silence the alarm temporarily. The three‑color LED indicates device status: green for normal operation, amber for low battery or fault, and red for alarm or test mode. For Wi‑Fi features and remote notifications, follow the instructions in the user manual to connect the detector to the Meross app.

Usage recommendations

Install detectors on ceilings or high on walls, following local guidelines for spacing and placement away from drafts, vents and direct cooking fumes. Test the unit after installation and check the LED status periodically. Replace the device according to the manufacturer’s lifetime guidance and follow local regulations for placement in sleeping areas and garages.