Accuracy innovative features and unbeatable affordability in one small user-friendly CO2 monitor. To deliver its measurements the Autopilot APCEM2 Desktop CO2 Monitor features a clear display system that boasts a digital chart of memory-logged CO2 relative humidity and temperature readings over an adjustable 24-hour or 7-day period. With the industry-new feature Trend Chart the device is able to trace the above quantities through past minutes hours or up to 7 days. The Autopilot APCEM2 Desktop CO2 Monitor is patent pending featuring a hook-and-loop fastener along the back that can securely affix a rectangular external battery pack. By maximizing mobility the device can be easily moved to any room—living room kitchen office—to monitor IAQ virtually anywhere. The Autopilot APCEM2 Desktop CO2 Monitor can be powered by almost any standard USB port that provides power such as a laptop a wall adapter or an external mobile battery pack (PowerBank). Battery pack not included.