This is the DC/DC converter with 24V/90W output designed specifically for the ResMed S9 CPAP machines.
Total weight of this DC cord is 1lb 10oz. With included alligator clip battery adapter, the weight is 1lb 15oz. Dimensions of the main "brick" are approximately 6.5" x 2.5" x 1.5".
This converter supports the use of heated humidification while running off either a 12V or 24V DC power source. The converter will automatically switch for either DC power source.