DUAL activation capable with either GripSense; Activation or controlled push button; GripSense Activation does not alter your grip; External Battery Access Door with tool-less entry; Easily programmable for steady or high-visibility pulsed laser beam; Ambidextrous TAP ON/TAP OFF switch reinforces safe firearm handling; GripSense Technology works with gloves; Fully adjustable for windage and elevation; Rounded and blended to ensure a smooth draw; For Smith & Wesson Shield, M&P 9mm, .40 S&W pistols