2-in-1 wireless interconnected smoke & carbon monoxide combination alarm CO Alarm density CO alarm Type B(provide a visual and audible alarm only.) 50ppm,alarms not activate within 120 minutes50-100ppm,alarms within 90 minutes 100-300ppm, alarm with 40 minutes 300ppm, an alarm within 3 minutes Execute Criterion:EN 14604:2005/AC:20EN 50291-12018 Design concept: 6 smoke inlet holes are surrounded, and the wall-mounted design is more conducive to the smoke inlet and alarm quickly. Practicality: 360 surround lights with no dead angle, the conventional smoke is usually a weak green light flickering, and the single-point light is very abrupt. This smoke sense is a full circle of light, and the hanging roof is more like a lighting decoration, flashing once every 60 seconds, like a living life, endless. When an alarm is issued, the red light flashes rapidly and continuously to warn of danger in all directions and inform users to evacuate urgently. Appearance: circular structure, arc design, elegant and beautiful, divergent ring design, more visual impact.