Genuine 3-Pin +24V 3.75A 90W AC/DC Adapter Compatible for ResMed S9 Series Model 369102 90 W IP21 DA90C24 R360-7213 Res Med CPAP Machine IP-21 DA-90C24 R3607213 External 90Watt Power Charger

Low interference and noise Advanced technology and high quality High efficiency and reliability World Wide Input Voltage 100-240VAC 50/60Hz. OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection). Tested Units. In Great Working Condition. UpBright 30 days money back guarantee. 1 full year service warranty. Tips: Rechargeable batteries don't last forever, the average battery last 1 to 3 years. If the battery is old/dead, it will not accept a charge. But not charger's problem. If you're not sure whether battery or charger is dead or not. You must have a volt meter in order to tell whether or not a charger is working.