Overview: Working theory: 1. This product adopts high-tech means, producing a kind of extremely special super low frequency electromagnetic wave, which is transmitted by the units blast-off component & power cable, can effectively stimulate the pest's (such as cockroach, ant, spider, flea & bedbug) nerve system & sense of hearing system in its governing scope, that makes them inadaptable & escape. 2. Can produce variable & fixed frequency ultrasonic to effectively repel rat, mosquito & other pests in its governing scope. 3. Many pests fear light. This product according to this principle to repel all kinds of pest in its governing scope. Application: This product widely applies in family, dining-room, hotel, hospital, office building, storage, farm & other indoor place use. Specification: Weight Approx:153.4g Size Approx:12 x 9.5 x 7.5