12V AC/DC Adapter Compatible for Respironics Pro M 1015642 CPAP Machine 50 System One REMstar Auto A-Flex 550 REF 550P 1051158 1024563 AA24750L 001 1058190 MW115RA1200N05 Resmed S8

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. This product is a compatible third-party accessory. 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.