2pcs Carbon Monoxide Detector with LCD Digital Display, CO Detector Equipped with a Replaceable Battery with Standard Lifespan UL2034 White

Easy to install: The CO detector comes with screws for easy wall or ceiling mounting. Requires 3 AA 1.5V batteries (not included). No wiring required, portable and easy installation, no outlet needed. The battery ensures continuous monitoring, even during power outages! The CO detector's battery can be used for approximately 36 months. It is convenient to replace the battery and has a long lifespan. High accuracy and reliability: Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels in real time. Instant alert: When the carbon monoxide detector reaches alarm levels, the CO sensor detects CO, the red LED flashes, the blue LCD backlight illuminates, and an early warning is emitted with a loud 85-decibel beep. Self-test function and informative LCD screen: The device will beep and the red LED will flash once when powered on. "888" will appear on the LCD screen. Then, when you press the test button, the device will beep and the red LED will flash. It displays real-time CO levels and memorizes dangerous CO levels since the last default setting. "Err" will appear on the LCD screen to indicate that the device is not functioning correctly. "Lb" will appear on the LCD screen to indicate that the battery is low and needs to be replaced. "000" will appear on the LCD screen for 3 seconds, then the device will enter normal operating mode. Wide application: Carbon monoxide detectors are suitable for living rooms, kitchens, bedrooms, offices, hotels, dormitories, and as portable CO2 detectors for travel, etc. They can effectively prevent fire accidents and provide reliable protection for your family's safety.