Convertible Smart Volt? Dual Ferrite power cord is used with our ultra low RFI emission Sun System? 1 Galaxy? ballasts. Cord sets include detachable 120 volt and 240 volt plugs providing the capability to convert the cord into either a 120 volt or 240 volt power cord. This dual ferrite noise-dampening cord may be used with other products, dampening ability will vary based on ballast used. Hawthorne Gardening makes no claims of ballast compliance if this cord is used with any other brand electronic ballast. The cord is 6.5 ft long.