5-liter per minute oxygen concentrator device

Peace be upon you and the mercy of Allah and His blessings This is a medical oxygen concentrator device for those who suffer from breathing difficulties; may Allah heal every Muslim. Its advantage is that it does not run out like an oxygen cylinder; it operates on electricity. The device is used but free from defects, God willing. You don't need to buy oxygen for it. The device has operated for approximately 900 hours.