Description Protect your home and loved ones with this Plug-in Carbon Monoxide Detector, designed for reliable and continuous safety monitoring. It accurately detects carbon monoxide (CO) while also measuring temperature and humidity, all clearly displayed on the LED screen for easy reading. With a plug-and-play design, simply plug it into any standard outlet—no installation or wiring required. When dangerous CO levels are detected, the alarm triggers a loud audible alert of ≥85dB along with a bright visual warning, ensuring you are notified immediately. The detector includes a built-in 1000mAh backup battery that provides temporary power during outages, keeping the device active even when electricity is interrupted. Compact and portable, it is ideal for use in homes, apartments, bedrooms, RVs, hotels, dormitories, and rental spaces. Features Stay Protected Anywhere You Plug In — Even During Outages: Just plug it in and this compact CO detector keeps monitoring—at home, in an apartment, or on every trip. With a built-in backup battery, it stays active even when the lights go out. 3-in-1 Upgraded Carbon Monoxide Detector: Adopts upgraded high sensitivity, high reliability and stability sensor for more accurate and faster detection.The clear digital display shows CO levels with temperature and humidity so you instantly know your room’s condition—no guessing. Long-Life CO Sensor for Everyday Confidence: Built with a CO sensor designed for up to 10 years of service life, offering long-term peace of mind without constant battery replacements. Compact Plug-and-Play Design for Multiple Locations: No wiring, no tools—just plug into any outlet. Works great in bedrooms, living rooms, RVs, hotels, rentals, dorms and small spaces. Dual Alarm System: Uses an electrochemical CO sensor with clear sound and light alerts when elevated CO is detected.The alarm volume for hazardous levels exceeds 85 decibels. Specifications: Model: NA503BCarbon Monoxide: 0~999PPM (±10%）CO Alarm Thresh