Rear Sight Laser (RSL) for Smith and Wesson’s Sigma VE. Easy-to-install and easy-to-operate, the new RSL offers a high-power laser with the benefit of not having to replace existing grips or internal stock parts. The RSL’s activation switch is a strategically placed button at the back of the slide that is easily activated by the thumb in a normal shooting position for left- or right-handed shooters. Does not interfere with your holster, built into the rear sight. Unopened package, sealed from the factory, the supplied batteries are no doubt bad so we are including two sets(8 batteries) to replace the bad ones.