What an annoying piece of ....!
It worked fine for 32 days.  One day after the return window closed, it quit working.  No response regardless of what buttons I pressed.  I tried charging it up.  Nothing happened.  Then, at 3 in the morning, it suddenly started running all by itself.  Scared the .... out of me.  It kept starting up at random times and running for a couple of minutes for two days until the battery ran down again.  There's no way to get in touch with the seller.  They don't respond to Amazon queries.  There's no website, email address, or any contact information.  I have seen other reviews describing similar problems.  I have also seen obviously fake five-star reviews.  No way to get my money back.  I bought another one from a manufacturer I have heard of.  I recommend avoiding this product, this seller, and this manufacturer.
Rating: 1 stars