Iana Dudrova 5 The product is very easy to use. The instruction has an English translation.I haven't seen a cockroach or a mosquito since I started using the product. So, money well spent!I also like that there are two devices in the same box, so I can put them in the different rooms.However, to work it should be plugged in constantly, which might be a problem for houses with a small number of outlets. Also, shines blue as plugged and becomes an additional light source (want you that or not).