This S9 90W Power Supply measures approximately 6.5 x 2.5 x 1.5 inches and weighs approximately 1.25lbs. It is designed to power both the S9 CPAP/VPAP and an H5i Heated Humidifier. It can also be used to recharge ResMed Power Station II CPAP/BiLevel Batteries.
This S9 Lightweight 30W Power Supply measures approximately 4.0 x 2.25 x 1.25 inches and weighs approximately .75lbs. It is smaller and lighter than the 90W version and should only be used to power the S9 CPAP/VPAP unit. It is not designed to power the H5i Heated Humidifier.