?HIGH-PRECISION 3-IN-1 CO DETECTOR?The 3-in-1 portable carbon monoxide detector can monitor the current CO concentration, temp and humidity in the air in real time. Equipped with a high-precision sensor (10-year life), the detectable CO concentration range is 0~500PPM, the temperature range is 14~122? / -10~50?, and the humidity range is 0~95%RH. The data is accurate without delay, and real-time monitoring allows you to know the air quality of the environment at any time. ?3 LIGHT INDICATIONS CUSTOM ALARM VALUES?The carbon monoxide alarm can present 3-stage light indications according to the CO concentration in the air. 0~49PPM (green area flashing=safe), 50~99PPM (yellow area flashing=warning), 100~500PPM (red area flashing=danger). By default, the CO alarm will sound an alarm when it reaches 50PPM. You can double-click the "function key" to customize the CO concentration alarm threshold. When the sound alarm sounds, you can press the "function key" to pause for 15 seconds. After 15 seconds, if the CO concentration continues to exceed the standard, the buzzer will sound again until the CO value is lower than the alarm value. ?LARGE CAPACITY BATTERY FAST CHARGING?This MINI 3-in-1 Carbon Monoxide Monitor has a built-in 1000mAh Li-ion battery and supports 10~65W fast charging protocol charging. TYPE-C fast charging can be fully charged in just 1 hour (regular 4 hours). The CO monitor enters low brightness power saving mode after 5 minutes of inactivity, and you can enjoy up to 120 hours of standby time. Ideal for travel, vacation, camping or any outing. ?OUTDOOR LANYARD MAGNETIC SUCTION?The bottom of the travel carbon monoxide detectors can be placed freely, you can put it on the table in the living room, kitchen, bedroom, etc. And it is equipped with a special outdoor lanyard, which is convenient for you to carry and use in outdoor activities such as travel, camping, picnic, and adventure. There is also a magnetic function on the back of the travel co detectors, which can be attached to any metal area such as home appliances or cars. ?SHOP WITH CONFIDENCE?Your satisfaction is our top priority. We provide 3 years service and lifetime technical support for CO detector portable. If you encounter any problems, just contact us through Amazon Customer Service or Q A and we will reply within 12 hours. risk-free shopping. Customer satisfaction is our tireless pursuit.