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5-in-1 Upgraded Natural Gas Detector & Carbon Monoxide Detector: Equipped with dual sensor technology and dual alarm system, it can detect and display temperature, humidity, natural gas and carbon monoxide concentrations in real time, providing all-round protection to ensure the safety of you and your family. Dual Alert System & Quick Response: The Carbon Monoxide Detector Plug in uses an audible and flashing light alarm design. When combustible gas or CO concentrations reach dangerous thresholds (CO 150PPM or natural gas 5%LEL), the detector immediately activates. The red light will continue to flash and a loud alarm sound (85 dB) will be issued as a warning reminder.