... 1, Mainly use for the transformer of the cockroach trap,cockroach killer, insect killer and so on. 2, 3v 3, 1 ... 3v Transformer For Cockroach Killer1, Mainly use for the transformer of the cockroach trap,cockroach killer, insect killer and so on. ... to various electronic cockroach, insect killer , small electronic mosquito swatter, etc2,The pictures of the cockroach killer transformer2, The technical ...