... by CE,CCC,ROHS,UL,TUV,ISO9001 AD22(LED)series of indicator is equally used LED shining chip as light source with ... long life,low consumption, small volume and light weight.AD22 indicators are produced by our factory enjoying by lots ... ,H,double color lamp, position indicator,shining buzzer and mini short indicator,as well as design shape of AD22-22G/22GS series button ...