GripSense Technology utilizes similar technology to smartphones, in that the product contains a detection zone in the area that users middle finger indexes the trigger guard of the firearm and senses the user?s grip on the firearm and activates the light or laser instantly. The user has the option to turn off the light or laser with the push of a button or disable the GripSense Activation and rely solely on the button activation. The CenterFire with GripSense technology is an essential sighting tool for training, concealed carry, home defense, and backup use, it projects a bright mint green light and a green laser aiming point downrange ? the perfect complement to Smith & Wesson M&P 9mm | .40 S&W small and easily concealed pistols. Rounded and blended to ensure a smooth draw, mounts to the frame without permanent alteration and offers ambidextrous switching to accommodate both right and left-handed shooters. Most operators report immediate improvement to hit ratios after installing a CenterFire GripSense light & laser sight. Green Laser and 100 lumen Mint Light GripSense gunsight compatible with S&W Shield 9/40mm Dual activation capable with either GripSense or controlled push button GripSense Technology does not alter your grip, accommodates left and right handed shooters while also working with gloves External battery access hatch with tool-less entry; Battery Type: LMS-2x13N; Water resistant design 10 minute automatic time-out prevents inadvertent battery drain Class IIIA laser,