ðə dɪvˈaɪs wˈeɪd θɹˈiː tˈʌnz ænd jˈuːzd ɐ lˈɪθiəm djˈuːɾɚɹˌaɪd sˈɛkəndɚɹi stˈeɪdʒ wɪð ɐ hˈaɪli ɛnɹˈɪtʃt jʊɹɹˈeɪniəm dʒˈækɪt pɹˈaɪmɚɹi.
The device weighed three tons and used a lithium deuteride secondary stage with a highly enriched uranium jacket primary.