1. Absolute carbon monoxide detector: When camping or in the caravan, a lot of carbon monoxide is produced. It is a colorless, odorless, and tasteless toxic gas that can be fatal if inhaled. The CF9R CO detector helps you monitor carbon monoxide levels to safeguard your health. 2. 6in1 portable design: The CF5R carbon monoxide detector for motorhomes detects CO, O2, air pressure, altitude, temperature, and humidity in real time. With its compact size of 2.8 x 1.3 inches, it easily fits in your pocket. It also comes with a 7.8inchlong lanyard for hanging or standing placement. 3. Electrochemical operation: Provides more accurate detection of carbon monoxide and oxygen. There is no delay—realtime monitoring ensures all data is displayed on the 1.45inch color HD screen of the CO meter, keeping you informed about the surrounding air quality. 4. Energysaving design: The screen dims after 20 seconds of inactivity, ensuring the CO alarm doesn't disturb your sleep at night while conserving energy. Press any button to illuminate the screen. 5. Audio and visual alarm: When the carbon monoxide level exceeds 50, the CO symbol on the portable detector flashes, and an alarm sounds. Press the power button to silence the alarm. 6. Easy to use: No complicated setup required—the CO detector is ready for immediate use and suitable for everyone. Longpress the power button to turn the CO detector on/off. Shortpress the 'M' button to switch between °F and ℃. Doublepress the 'M' button to toggle the altitude display between meters and feet.