These are very solid locks and work quite well but you need to apply some WD40 or suchlike to prevent them getting corroded looking (I had some surface rust after a short while).
The biggest problem is that the batteries don't seem to last long enough. I contacted the supplier and they gave fast a good advice and even sent me a load of extra batteries after a couple of the locks died very soon after getting them.
The are big strong locks and I use them but I can't be bothered to replace the batteries so often so am not using the alarm feature anymore, which was the whole point in having them. Sorry.