Gel Foam Wheelchair Seat Cushion Sanitizing Accessory but users have the option

but users have the option to purchase additional batteries for extended usage time

500 ft Warranty 3 Years (1 Year on Pre-Owned Units)Please note - Any smoking while using the unit or evidence that unit has been used in a smoke filled environment will void the warranty

All you gotta do is: slip out the used battery and slip in the new/recharged battery

The AirFit N20 cushion features an adaptive InfinitySeal design that fits various facial and nasal structures

Gel Foam Wheelchair Seat Cushion Sanitizing Accessory but users have the optionThe Drive Medical Gel Foam Wheelchair Seat Cushion is designed with comfort and pressure relief in mind. The cushion is constructed with a gel bladder surrounded by high density foam to mold comfortably to the user. As an added bonus, the breathable cover can easily be removed and washed to ensure a safe and sanitary condition. All these features ensure proper skin integrity and help prevent pressure ulcers and sores.