Specifications of the Freestyle 5L Portable Oxygen Concentrator: The Airsep Freestyle is one of the smallest and lightest oxygen concentrators in the world. The lightweight and compact size of the oxygen concentrator allows the user to move and travel with it without clutter or hassle. The Airsep Freestyle is equipped with a self-illuminating control screen on the top of the device. The screen displays the battery charge level and oxygen concentration rate and sends visual alerts to the user. The oxygen concentration rate can be set up to 1050 ml per minute as per doctor's instructions. The Airsep device operates using a removable and rechargeable internal battery. The Airsep Freestyle responds to the user's breathing pattern and adjusts the oxygen flow to suit the user's needs. The Airsep Freestyle operates for 8 hours on a fully charged battery, allowing the user to spend more time with freedom and comfort. Batteries can be charged using the car's power outlet. The oxygen purity in the Fox reaches 93%. Accessories for the Freestyle Oxygen Concentrator: Device storage bag. AC/DC power adapter. AC power cord. Rechargeable battery. Freestyle Device Dimensions: 18.5x7.8x25.4 cm Airsep Freestyle Device Weight: 2.3 kg. Brand: CAIRE. Like new, used for only one month.