E2S Upgrade LED Beacons for a Brighter Future E2S Upgrades the STA/STB LED beacons to the latest LED technology and add UL approval as standard. Posted on 9 September 2020 Filed under Audiovisual Signalling, Company News, New Products Tagged: Alarm Beacon, E2S, LED Beacon, New Product, Product Upgrade, STA/STB Range, Status Indicator