Read the reviews. Most have had the same problem of them only working for a few days or weeks. Junk. I wouldn't trust this cheap chinese faulty crap. Might burn your house down.
Mosquitoes aren't attracted to UV light. They are attracted to carbon dioxide from the breathe and the body odor.
Purchased these the first time they offered them. They worked but the bottom of the light falls out after a few days use. Had to return them.