[Upgraded Multi-function 4-In-1] The carbon monoxide detectors can monitor the current CO, CO2, temperature and humidity in the air in real time. Equipped with high-precision sensors, the detectable CO concentration range is 0-1000PPM (10%), the CO2 concentration range is 400-5000PPM, the temperature range is 14-122/-10-50 (1.5), and the humidity range is 0-95%RH (5%). [Easy to Carry] Our CO2 Detector is very portability, measuring just 2.99 x 2.75 x 1.18 inches and weighing only 0.22 pounds. Equipped with a lanyard and magnetic back, it can be conveniently hung or attached to various surfaces, including wall, backpack, tent, car, RV, hotel, kitchen, dormitory and garage. The CO detector can present 3-level light indication according to CO and CO2 concentration. [CO] - 0-99PPM (green light flashing = safe), 100-149PPM (yellow light flashing = warning), 150-1000PPM (red light flashing = dangerous). [CO2] - 400-699PPM (green light flashing = safe), 700-1499PPM (yellow light flashing = warning), 1500-5000PPM (red light flashing = dangerous) Note: When the red light flashes, the alarm sound. [Accurate Real-time LCD Value Display] Equipped with LCD color display and high-precision sensor, real-time monitoring of CO & CO2 gas concentration. Using extra-large CO value fonts, making air quality more intuitive and potential hazards easier to detect. [Large Capacity Rechargeable Battery] This carbon monoxide alarm is equipped with a 1000mAh battery and Type-C charging. It can be used continuously for 10 hours after charging for 1 hour. It automatically enter power saving mode after 5 minutes of inactivity, which can continuously protect the safety of you and your loved . This advanced carbon monoxide detector monitors CO, CO2, temperature, and humidity in real-time. It features high-precision sensors with the following measurement ranges: CO Concentration:0-1000 PPM (10%) CO2 Concentration:400-5000 PPM Temperature:14-122/-10-50(1.5) Humidity:0-95% RH (5%) Intuitive Light Indication - The monitor features a 3-level light indication system based on CO and CO2 concentration: CO Levels: 0-99 PPM: Green light flashing (Safe) 100-149 PPM: Yellow light flashing (Warning) 150-1000 PPM: Red light flashing (Danger) CO2 Levels: 400-699 PPM: Green light flashing (Safe) 700-1499 PPM: Yellow light flashing (Warning) 1500-5000 PPM: Red light flashing (Danger) Note: When the red light flashes, an alarm sound. Colour:Green Material:ABS+ electronic components Package Contents: 1 * CO2 Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.