T-Power 18vdc AC Adapter Compatible with Big Blue Studio Wireless Bluetooth Speaker,BROOKSTONE DESIGN USA P,N: KSAS0451800200HU Switching Power Supply Cord Charger INPUT: 18VDC - 110V ~240V ( work in U.S ) 18v dc Compatibility: Big Blue Studio Wireless Bluetooth Speaker / BROOKSTONE DESIGN USA P/N: KSAS0451800200HU T-Power - manufactured with the highest quality materials and include multiple smart features safeguarding against IV - incorrect voltage, SC - short circuit, IO - internal overheating. CE/FCC/RoHS certified