Great product, but be careful when inserting batteries - Crimson Trace Smith and Wesson J-Frame Revolver Round Butt Lasergrip Green Laser Sight

I bought this CT green laser grips for a J Frame S&W revolver. I returned iit do to a problem with the switch where it would often not illuminate. I returned and replaced it and learned from a call to CT customer support that the battery cover has two tabs that must be placed in slots under the rim of the battery case. The instructions manual did not specify this requirement. Now, they are working perfectly. Also, the unit was manufactured over a year ago, so the batteries were at least that old. CT sent me fresh batteries. Having a laser does not substitute for training, but in a panic situation, and the additional aiming enhancement is most welcome. If the unit had better instructions and came with fresh batteries, I would give it 5 stars.