... transformer 1.Universal usage 2.Certificated with CE,CCC,CQC 3.OEM/ODM available 4.Output voltage 6V~36V EI 57 ... Convenient installation,High performance to price ratio,low-power consumption,and nice shapeWith lamination size rang of ... 3 to match with the requested powerSpecification:EI:57*30Input voltage:100~240V/50Hz-60HzPower: 31WStable ... and designs on your options EI 57 low frequency transformer