Werma signaltechnik led evs element for kombisign 70 and 71 signal towers werma signaltechnik 64414055 the werma signaltechnik 64414055 is a 24v dc led evs element ideal for use with the kombisign 70 and 71 signal towers 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 the flickering of neon lamps and comparable lighting effects are highly effective at attracting someo