Werma signaltechnik led evs beacon werma signaltechnik 28016055 the werma signaltechnik 28016055 is an led evs beacon that will ensure a maximum attention grabbing effect the enhanced visibility system or evs for short is the name werma has given to this latest development which promises to bring about a revolution in signal technology this red beacon is effective in signalling extremely hazardous situations where there is a need for immediate action werma signaltechnik 28016055 led