Werma signaltechnik base mount led evs beacon werma signaltechnik 82939055 the werma signaltechnik 82939055 is a base mount 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 yellow beacon is effective in signalling extremely hazardous situations where there is a need for immediate action werma sign