This device is a NIDEK Nuvo Lite oxygen concentrator, designed for home or clinical use. The device provides a continuous oxygen flow with a concentration of up to 90% or more at a rate ranging from 0.125 to 5 liters per minute. The device is characterized by its light weight, which is about 13.6 to 14.5 kg, making it easy to transport using the wheels at its base. The device operates on electricity (AC current) and does not have an internal battery, and it consumes low power, especially when used in economy mode. Country of Manufacture: America The device was opened for testing and used only once All accessories are present