Upgraded 4-in-1 Detector: This advanced Natural Gas and Carbon Monoxide Detector combines sensors for natural gas, carbon monoxide, temperature, and humidity. Featuring robust performance, dual sensors, a dual alarm system, and fast response, it offers all-around protection to ensure the safety of your household. Quick Response Dual Alert System: This RV carbon monoxide detector is equipped with both visual and audible alarms. When gas levels become dangerous (CO ? 150 PPM, natural gas ? 5% LEL), the red light flashes repeatedly, accompanied by a loud alarm (? 85 dB). This immediate notification enables you and your family to quickly detect threats, providing essential protection for your safety. Eco-Friendly Energy-Efficient Design: This plug-in carbon monoxide detector is compatible with AC 110V~220V and operates with a low standby power consumption of ? 2W, making it highly energy-efficient. Its durable electronic sensor has a long lifespan, reducing the need for frequent replacements and offering an environmentally friendly solution. LCD Display Versatile Use: This RV carbon monoxide and propane detector features a clear LCD color screen, displaying precise readings for carbon monoxide (0-2000 PPM) and natural gas (0-10% LEL) levels. Its compact size saves space, making it ideal for various settings such as homes, hotels, RVs, and cruise ships. Important Usage Notes: Before using, please remove the protective film. After plugging in, allow 180 seconds for the detector to adjust to its environment. Press the self-test button to trigger the alarm. Additionally, as the device may generate heat after powering on, wait 30 minutes for more accurate humidity and temperature readings.