CAIRE Freestyle Comfort Oxygen Concentrator with low hours . Comes with 3-{THREE!} Batteries, AC and Auto charging cords,and carry case ,with strap.I know at this price ,you are concerned about function. I have O2 purity test meter to demonstrate its output,and can show hour meter. Daniel. prefer e-mail,but show contact info
-,leave message if no answer.I will require cash -price firm..