Poor delivery. When I opened the package and lifted the box, I heard a rattling noise coming from the box. This is not good. One of the two lightbulbs shattered into pieces. I carefully pulled out the unbroken lightbulb so as not to go to the ambulance. Lo and behold, it really worked. My insect repellent is working again. Not sure how long it will stay. Bad quality control. I definitely do not recommend this product._-----_------_Update. Well, the (good) bulb lasted about 2 weeks. It burned out completely. Terrible product. I definitely don't recommend this to anyone.