Features of LASERMAX Lightning Rail Mounted Green Laser GS-LTN-G. GripSense Activation senses the users grip within the detection zone and activates the sight. Dual activation capable with either GripSense or controlled push button. Does not alter your shooting grip. Easily programmable for steady or high-vis pulsed beam. External Battery access hatch with tool-less entry. Product Info for LASERMAX Lightning Rail Mounted Green Laser GS-LTN-G. Represents the newest generation of laser activation technology by simplifying the activation process. The user simply grips the firearm, setting off a motion sensor once in the detection zone, which then activates the laser immediately and does not require the user to change their firing grip. Activation Technology includes some significant innovations including a fully programmable operating mode, and up to twenty hours of continuous battery life- safeguarded from inadvertent drain by a ten-minute time out feature. Will come in Vivid Red or Daytime. Being the most visible color to the human eye.