This IoT based Indoor Environment Monitoring device provides a demonstration of how IoT device can help acquiring data from various sensors with optimal energy usage. This device is a single board with integrated sensors. It is designed to sense the factors of our daily living environment such as temperature, humidity, barometry, and gas concentration. By fusing all data together, the device itself can provide an insight into the air quality index of your living environment. Last but not least, the device is powered by a single battery; and the battery level could be monitored via our cloud platform.