Whisper-quiet operation & very small. Includes discreet carry bag, Optional integrated heated humidification system easily docks into bottom unit. Auto on/off automatically starts flow of air after breathing into mask and stops flow of air when mask is removed, Delay pressure ramp eases machine to prescribed pressure – allowing the user to fall asleep at a lower pressure. SmartCode® compliance tracking encodes usage data that can be communicated to a clinician. Optional SmartLink® Therapy Management System provides detailed patient therapy data, including oximetry. #DV51D-HH UNSPSC#42272202 NJCore