electronic transformer, CSA, CQC, UL,VDE, ROHS complaint,outer diameter: 21.5 mm,Product thickness: 9.0 mm,making a sample first electronic transformerCircumstance temp 0--+40 degreeAppearance &dimension: as imageouter diameter: 21.5 mmProduct thickness: 9.0 mmDC resistance: at 25 degree 2.5Ω ± 10%If needed, techonical drawings can be provided.