The Novita 550 is a thermal turn signal flasher that operates at 12 V. Developed in the early 1940's, thermal turn signal flashers use heat, generated by electricity, to bend spring steel internally which causes the flasher to operate. Thermal flashers are made in overseas however, the Novita LL552, EL12 and LF12 feature newer technology and are direct replacements that are made in the U.S.A.