... Certified by CE,CCC,ROHS,UL,TUV,ISO9001 AD22(LED)series of indicator is equally used LED shining chip as light source ... color lamp, position indicator,shining buzzer and mini short indicator,as well as design shape of AD22-22G/22GS series button and it ... .(2)Insulated resistance≥2MΩ(3)Voltage wave allowed by AC indicator±20%(4)Continual working life≥30000h(5)Brightness≥60cd/m2 ...