I received this and found out the same day that it was a piece of junk. Perhaps there is a version of this that actually does the required job, but a bike "chain breaker" that can't break a bike chain is about as useful as a chocolate fireguard.
In my case the threads were knackered inside the mechanism, so each time it got to the crucial point, where it should be pressing the pin out, it just jumped back a thread or two.
To make matters worse the seller then referred me to the manufacturer saying that the manufacturer provides a lifetime guaranty. I reminded the seller that within 30 days it is up to them to provide a refund or replacement. Seller did not reply.
Disappointed with both the product and the seller.
My advice - buy this if you want to but I would say chances are better than 50/50 it will be junk.