this was a real disappointment.  I have 4 watches that all use batteries and need occasional battery replacement.  this item came and I could not open one, much less four of the watches I have.  the tool is cheap, the little screw in points for different watches were cheap and not one of them fit any of the watches I have ( and my watches are common, well know brands).  I not recommend this item.  either cough up the 10-15 dollars for a battery change or buy a more expensive one that will work.  This is like throwing your money away.