Product review (3 stars): Lack of instructions make this item average, or less.
Very small, and lack of instructions on how to change battery.  I was unable to close the battery location, so, I taped it shut.
 I am presuming it is accurate.  The lack of instructions is odd....especially when there is a comment in the very small instructions that says
"(only suitable of some models)/ There is no indication of which model that comment applies to.  Very strange, indeed.