JNHCD Test Button Carbon Monoxide Detector

2-in-1 Fire & CO Detection
High-sensitivity photoelectric sensor detects smoke early, while stable electrochemical sensor monitors CO leaks for complete home safety.
Loud Audible & Visual Alerts
Emits ≥85dB alarm at 1m with bright red LED flashes, while LCD shows real-time CO concentration for instant safety awareness.
Long-Lasting Battery Power
Runs on 3×1.5V AA batteries lasting up to 1 year, with chirping alerts every 60s at low voltage for timely battery replacement.
Smart Safety Functions
Test button verifies performance, auto-reset and malfunction check ensure reliability, with resistance to dust, moths, and light interference.
Easy Installation Options
Mounts easily on walls or ceilings with included hardware, ideal for bedrooms, hallways, attics, basements, and other key areas.