The ResMed AirMini™ N20 Setup Pack is a pre-assembled setup pack that includes a long breathing tube with the specialized elbow adapter to easily connect AirFit N20 Nasal Masks to ResMed's ultra-portable AirMini Auto-CPAP Machine. There are 2 HumidX™ Humidifier filters (1 Standard & 1 Plus) that are also included with this setup pack. HumidX™ Humidifiers sit directly between the mask and machine to provide effective humidification without the need to use water.