Yes. ResMed offers an 90W power supply that can be used to connect a ResMed sleep therapy device and its humidifier to the mains electricity supply. If your patient doesn’t need a humidifier, the smaller, lighter 30W Power Supply might be more convenient and is available for the S9 therapy devices only. These power supplies can be plugged into wall sockets with an AC configuration and cannot be used with a DC configuration. Patients who need to power their sleep device from a car or boat battery or similar, will need the DC converter.