1. It worked by electromagnetic wave, transmitted along the wire then spread to the whole room (including the ceiling, because the ceiling usually have cord) 
 

2. There are three kinds of plug (GS, UL, BS) to choose from

3. This product not only can drive mouse away ,but also have good function of repelling cockroaches, ants, fleas, spiders, centipede,

4. Equipped with a green lighting can be used at night, also can attract mosquito

5. Effective range: 230 square meter.

Specification: