AirFit F20 Cushion Size:Medium The AirFit N20 headgear is

The AirFit N20 headgear is the replacement headgear for the ResMed AirFit N20 nasal mask

but via the SD card rather than an app — there's no wireless/app connectivity on this model

levels 1–3 Comfort AutoRamp with sleep-onset detection

and the corresponding ResMed AirFit mask

AirSense 11 AutoSet device

AirFit F20 Cushion Size:Medium The AirFit N20 headgear isReplacement cushion for the AirFit F20 full face mask InfinitySeal adaptive silicone for a comfortable, leak resistant seal Available in Small, Medium and Large The AirFit F20 cushion is the replacement cushion for the ResMed AirFit F20 full face mask. It features ResMed's InfinitySeal adaptive silicone, which delivers a reliable seal and flexes with your movements to prevent leaks. The design suits most facial structures and uses a thinner, softer