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 turned on, the device can constantly monitor carbon monoxide concentrations 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 1000 mAh. Once fully charged, this CO detector can operate continuously for approximately 70 hours in standby mode. When the battery is low, simply recharge it with a USB charging cable, without having to replace the battery. High Accuracy and Long Life: This CO detector uses the principle of electrochemical reaction to measure CO concentration. The carbon monoxide sensor in this CO detector offers high measurement accuracy and a long lifespan of approximately 5 years. Approximate real-time detection: Compared to traditional CO detectors, this portable CO