Automatic destroys bugs, mosquitoes, flies! For Electric Mosquito Repellent, the recommended height from the ceiling should be between 0.8-1.2m and the distance to the wall should be more than 0.3m. There is no chemical and odor effect when using this lamp. It has the advantage of protecting the environment, limiting flow, low power consumption and high efficiency. Especially suitable for bedroom, living room, office, etc. It is an ideal product for indoor use. It can also eradicate flying insects, mosquitoes and annoying insects from your home. A killer's effective kill zone is 16, and for nothing this lamp abstracts the lights. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.