... has many diameter specifications.Five color can be chosen. The led Indicator Light is developed by ourselves.Which widely used in switch buttons ... many diameter specification:Φ4mm,Φ5.5mm,Φ6mm,Φ7mm,Φ8mm,Φ9mm,Φ10mm,Φ18mm,Φ19mm.ect.The color has red,yellow,green,blue ... be made use rectifying tube or directly current both ok. LED indicator lightItemColorAC/DC Φ4 R/YG/Y/G/B/WAC/DC ...