TOAMIT CO2 Manager (CO2 Concentration Meter) This is a used item. Operation has been confirmed. Although it may be difficult to see in the images due to lighting conditions, it functions normally. [Contents] ・Main unit ・Micro USB cable (power supply confirmed) ・Instruction manual ※Box is not included. ※There are minor scratches and scuffs from use, but there are no problems with usage. ※Please purchase only if you understand that this is a used item. How about using it as a guide for ventilation management? Recommended for telework, classrooms, offices, etc. Instant purchase OK!