16MM LED indicator features secret-until lit function

APEM Q16 Secret-Until-Lit LED Indicators features a black polycarbonate insert that provides the ability to hide a specific custom legend until the indicator illumination is turned ‘ON’. The polycarbonate insert is reverse-side silk screen printed, allowing for any custom symbol you require. Product includes a standard rear epoxy-sealed bezel for IP67 protection from harsh environments and rugged outdoor applications. http://www.apem.com