The CO detector integrates carbon monoxide, humidity, and temperature monitoring, tracking harmful gas concentrations, humidity, and temperature in real-time and displaying them on a 2.48-inch HD screen. This CO detector features an upgraded built-in sensor for improved accuracy and longer service life in detecting carbon monoxide. CO detection range: 0 to 1000 PPM; Humidity range: 0% to 95% RH; Temperature range: -4°F to 140°F. The alarm is activated when CO levels exceed 50 PPM: 50–100 PPM: 3 alerts within 3 minutes; 101–200 PPM: 5 alerts within 5 minutes; above 200 PPM: continuous alert. The carbon monoxide detector includes a built-in 1000 mAh rechargeable battery with a Type-C charging port, offering fast charging in approximately 4 hours and standby operation up to 72 hours. When there is no user interaction or alarm signal, the backlight turns off and the device enters low-power mode, while still detecting carbon monoxide every 2 seconds. The detector features three buttons and is simple to operate. Long press the "ON/OFF" button to power the device on or off. Short press the "ON/OFF" button to switch between display modes. Short press the "M" button to adjust screen brightness. Short press the "S" button to mute or enable the alarm sound. The CO monitor is compact and portable, designed with a stand and lanyard (dimensions: 3.5 x 2.1 x 0.7 inches, weight: 0.14 lb), allowing it to be placed on a flat surface or hung up. Suitable for use during travel, outdoor camping, in RVs, and in indoor areas such as living rooms, bedrooms, kitchens, bathrooms, and garages. Portable mini carbon monoxide detector with 3-in-1 functionality for CO, temperature, and humidity detection. Features a large LED display with color screen and backlight, buzzer indicator, 1000 mAh battery, compact design, stable stand, and multi-scene use. Color: White. Material: Plastic. Package contents: 1 x carbon monoxide detector. Note: Lighting effects and display settings may cause slight variations in the color appearance between the product image and the actual item. Measurement may vary by +/- 1-3 cm due to manual measurement.