Signal Construct SK 05 Series LED Symbol Indicators 5mm Snap-In Mounting – Signal Construct SKGD05104, A yellow 5mm LED Panel indicator with a round lens head and a 24 to 28V AC/DC operating voltage. The indicator is of the snap-in mounting type and has a frosted lens surface that gives a high level of light transmission and a clear on/off contrast. Signal Construct SKGD05104 LED Indicator 5mm Mounting Yellow 24-28 VDC/AC Round