This bug killer works automatically. House flies and mosquitoes are attracted by the unique color of the UV light and octanol, fly towards the tubes. When the bug comes in contact with one of its tubes it is immediately killed by the electrified rod. This mosquito killer poses no health hazards, however, children should avoid going near it. As the rod is electrified, it can be dangerous if touch carelessly. This device is lightweight and can easily be hanged at your desired place. The light is strong enough to attract insects but not too strong to actually disturb your sleep on a night. It has 6 Watt tube fixed inside, it is an Ultra Violet light that glows with a bright purple color. This tube is replaceable.