Not practically effective at all - NcSTAR Compact Pistol Laser Sight w/ Blue Laser/Strobe

Within a week, not even I would say. This laser would not work properly. It would not turn off while on the pistol, therefore making it useless. Literally every time I turned it on it would not turn back off and I had to extract it from the pistol and take the batteries out. I’ve also emailed NCstar about this twice and have not received anything back. This pretty much applies to the whole “buy cheap buy twice”. Overall disappointing