ResMed S8 AutoSet II CPAP unit is one of the leading models in ResMed's S8 series. The unit features optional heated humidification, data downloading, and EPR Easy-Breathe technology for more natural breathing. The unit contains ResMed's unique AutoSet algorithm which operates on breath-by-breath basis and automatically finds the lowest required CPAP pressure needed to prevent majority of snoring and apnea events. This is the quietest machine available in today's marketplace with an operating noise of only 24 decibels.