Compact and Lightweight: This portable carbon monoxide detector is very compact and lightweight. It can be used in cars, RVs, while traveling, or camping. Once the device is turned on, it can continuously monitor the carbon monoxide concentration and protect you from possible carbon monoxide poisoning anytime, anywhere. Built-in Rechargeable Battery: This CO detector is powered by a built-in rechargeable lithium battery with a capacity of 1000mAh. Once the battery is fully charged, this CO detector can work continuously for about 70 hours in standby mode. When the battery is exhausted, simply recharge it with a USB charging cable, without having to replace it. High Accuracy and Long Life: This CO detector uses the principle of electrochemical reaction to measure CO concentration. The carbon monoxide sensor of this CO detector has high measurement accuracy and a long service life of approximately 5 years. Approximate real-time detection: Compared to traditional CO detectors, this