The Crimson Trace RailLight is the next generation in pistol mounted lights. Made of Aerospace Aluminum, with no exposed fasteners in a snag-free design, you will be hard pressed to find a better option. The downward facing Red LED Walking Light will allow maneuvering without affecting your vision at night if needed. The Red LED Walking Light is independently enabled/disabled at the user's discretion and is activated using CT Motion "shake to wake" functionality. Features16340 li-ion rechargeable battery includedBottom access battery compartmentCr123 battery compatibleMemory retention: remembers the last used settingAttaches to mil-spec 1913 pic rails, pistol accessory rails, and most glock accessory railsInstant activation: tap-on/off with momentary onLarge ambidextrous +/- side buttonsBuilt-in dimming feature 5-1,000 lumensRed led walking light with ct motion activation can be turned on/off at user's discretion