Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: will this fit the kahr pm40?
Document: Easy to install and use. The switch is a bit fiddly but otherwise it's a nice addition to my Kahr PM9.
as advertised perfect fitment and very easy to use would recommend this laser to anyone with a CM 9 kahr
Initially I thought this was a great deal. I recieved the lasermax in just a couple of days.fast shipping I must say. I was very anxious to use it right away. But before I could mount it to my kahr cw9, I had to check to see if it powered on. Of course that never happened. The laser max came packaged with the battery in place. I took the battery out.. just to see that it was corroded on. I am very upset.
The laser site was easy to install on my gun and easy to adjust the laser. The price was reasonable too.
Not only did I have to spend more money, but the aggrevation I had. You purchase new products, expecting them to work right out of the box. Hopefully I can get this resolved and get a new lasermax.
Answer: no