Opened up an item not described case, was really nasty, and accusing me of being wrong. He later admitted to me it was a big misunderstanding on his part. He said he needed large size smoke detectors and sent me a picture of the item that he was replacing, and I pointed out that the MPN on his item did not match what I had. My MPN was correctly stated in both the title and description on eBay. I wanted to be cool about it and accept the return because he said he never opened up the boxed case and apologized, but he lied and returned an opened up case that was originally factory sealed which devalues it. Shipping was about $17 which I lost money on, plus I had to take less by reselling it as used. Some people don't realize that they are scammers.