Pocket CO, designed and built in the USA by KWJ Engineering Inc, is the world's smallest renewable carbon monoxide detector. Its advanced technology, tiny size, and ease of use, make it perfectly suited for many applications and activities where CO levels should be monitored. In addition to keeping users safe from immediately dangerous levels of CO, Pocket CO also allows monitoring of lower CO levels, which pose long-term exposure health risks. Pocket CO also collects information, which can be downloaded to any computer using the SmartPocket Reader, such as maximum and average readings over time.