I must've gotten unlucky with this purchase, seeing as though there are many positive reviews so I am probably the outlier. When I received my purchase, I put the batteries in, but the first thing I noticed was the lid didn't even fit over the batteries, which meant the penlight doesn't close. Also the penlight is an empty tube, with no bulb. No matter which combination I try, there is no way to close the penlight and no way to close the circuit to turn it on. The cheap plastic penlight I got for free from a friend works better than this $20 one, because well...at least it works! Would not recommend. I ignorantly threw out the packaging once I received it, because I thought the light surely would work. Now, I likely will not get a refund, so I spent $20 to get a ...tube of thin metal, how wonderful! Terrible return process! Oh well, that's okay, I guess it's just what happens with dodgy products sometimes :,)