The LaserLyte UTA-SH laser for the Smith and Wesson M and P Shield mounts easily and quickly on the M and P Shield trigger guard and snugs-up securely to the dust cover. It’s simple to activate with the ambidextrous, ergonomic switch. The LaserLyte UTA-SH laser is easily programmable to either constant on or pulse mode. Another great function is the "auto-off" feature that displays a unique flash after 5-minutes of operation and automatically turns the unit off after 6-minutes. In actual usage* the battery life lasts 5-hours in constant on and 10-hours in pulse mode (*actual usage is: 1 min. on and 1 min. off). Made of 30% glass filled nylon and steel mounting hardware.