The large LCD screen displays the current setting and remaining battery life in color. If the Comfort sound is an IE alarm low battery or a separate nasal cannula, the user will be prompted with an easy-to-understand drawing on the screen to help troubleshoot the problem. The Caire FreeStyle Comfort is available with a removable 8- or 16-cell battery that conveniently opens at the bottom of the machine. It is a high-capacity Caire Freestyle comfort portable oxygen concentrator that provides patients with all the oxygen they need. This lightweight and compact device features five pulse settings on demand 1-5 liters per minute and is light enough to carry comfortably, weighing only 5 pounds (2.3 kg). Using it is very simple, it has all its purposes