Personal Therapy Assistant includes interactive features that are designed to help you start therapy with ease and confidence. PTA is exclusive to AirSense 11 users. It offers interactive, voice-guided video instructions to help you set up your equipment at home and troubleshoot common issues. It also provides access to the Test Drive therapy acclimatisation tool, which helps you to gradually test different levels of pressure, check your mask seal and learn how to improve your mask fit if necessary.