This is not compatible to old PR System one machines. They will have to use the 12v cigarette lighter charger. DC 12-Volt Power Cord for Respironics devices conveniently allows you to extend the power source versatility of your device by allowing you to plug in your Respironics 60 series CPAP or BiPAP device to a handy 12-volt cigarette lighter in your vehicle, ensuring that therapy continues even when you are not at home or in the hospital. The DC 12-Volt Power Cord for Respironics, Cigarette Lighter is made specifically for the 60 Series CPAP Machines. Aside from cigarette lighter socket, it can also be used with a standard 12-volt battery.
This is the new cigarette lighter power adopter charger for Respironics 60 series machines> it is compatible to : DS150TS/DS160HS, DS250TS/DS260HS, DS450TS/DS460HS. DS550TS/DS560HS, DS650TS/DS660HS, DS750TS/DS760HS, DS950TS/DS960HS. This is not compatible to old PR System one machines.