Tesla UEAJ-II series are the second-generation siren series from the company TESLA Blatná a.s. Althought these series had impoved hardware and software equipment, they didn't come off as popular as the first-generation series, mainly because the results were not as impressive, compared to other models from different manufacturers. Tesla UEAJ-II sirens use aluminium horns, and and come in 600W or custom variations. TESLA has made many changes to the second generation. Mentionable changes are major changes to the control unit (deployment of better amplifiers, more user-friendly interactions etc.), and as mentioned before, the deployment of aluminium horns. 

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During the development, TESLA has experimented with many aluminium horn options, deciding for example between standart-shape horns of Gibon-like speakers. The company tested many types of drivers, including some from 100 V PA systems, with radio units and wireless activation press-stations.

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Tesla UEAJ-II units are not as common as the first generation on the field. Rarely, some Tesla UEAJ-I siren head units can be seen with II's hardware, such as in Blansko.