Peace be upon you This device is a Philips Respironics EverFlo home oxygen concentrator, designed to provide pure medical oxygen. It is relatively lightweight (about 14 kg) and has wheels for easy movement around the house. It provides a continuous oxygen flow rate ranging from 0.5 to 5 liters per minute. The device includes a humidifier bottle, and operates at low noise levels (less than 43-45 decibels). Free of charge for the sake of God. The reason for giving it away is that we no longer need it. May God heal all Muslims (I do not permit anyone to take it with the intention of selling it). (Shipping costs, if outside Al-Qassim, are the responsibility of the one who wishes to acquire it).