Crimson Trace Springfield Armory XD-S 4.0 9mm/.45 ACP Laser Guard with Blade Tech Holster Boxed, Red INSTINCTIVE ACTIVATION: Front activation button engages the laser immediately when the firearm is held in a normal firing grip. This is the feature that sets Crimson Trace apart from the rest. OVER FOUR HOURS OF BATTERY LIFE: Powered by one 1/3N Battery (included). This product is eligible for Crimson Traces Free Batteries For Life Program. FITS: Springfield Armory XD-S EASY INSTALLATION: User installed- no gunsmithing required. Factory sighted at 50 feet, but is fully user adjustable for Windage and Elevation with provided tool. This model features a master ON/OFF switch for completely powering down the unit. BUNDLE INCLUDES: Laser Sight and IWB Kydex Holster This laser is in conformance with and complies with 21 CFR 1040.10 with a maximum power output of "5mW" for a "Class 3R Red Laser"