T-Power ( 6.6 ft Long Cable ) for GOODKNIGHT 420 SERIES GoodKnight Good Knight 420G 420E 420S 420SP CPAP MACHINES Replacement Ac Dc adapter Switching Power Supply Cord Charger Compatibility: GOODKNIGHT 420 SERIES GoodKnight Good Knight 420G 420E 420S 420SP CPAP MACHINES INPUT: 110V ~240V ( work in U.S ) T-Power ac adapters are made with the highest quality materials / products were tested by manufacturer to match and/or exceed specifications of OEM products / 1-year limited warranty Compatibility: GOODKNIGHT 420 SERIES GoodKnight Good Knight 420G 420E 420S 420SP CPAP MACHINES