Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
device [dɪˈvaɪs] n устро́йство, прибо́р (ploy, stratagem) сре́дство
explosive device взры́вчатое устро́йство
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.