Made in USA. Continuous oxygen flow from 0.5 to 5 liters/minute. Equipped with OPI technology to monitor oxygen purity. Quiet operation, economical in electricity consumption, and easy to transport with wheels. Comes with a humidifier bottle as shown in the pictures. The device operates efficiently and is suitable for home and medical use. Its specifications include an oxygen concentration of up to 93% ±3% and a flow rate of up to 5 liters/minute. � Philips +1 Price: By offer, and sold to the highest bidder. Contact via private message •