Enhanced Compatibility: Designed to allow select Streamlight Protac Rail Mount lights to work with compatible Scout tailcaps and remote switches, improving versatility. Tailcap Requirement: Requires a Surefire/UE/DS tailcap (sold separately) for optimal performance and is NOT compatible with Streamlight/Protac 2.0 Rail Mount Lights or HL-X Laser models. Flicker Prevention: Includes two o-rings designed to stabilize batteries during recoil, helping to address flickering issues that may occur with some light models. Full Functionality: Retains complete functionality of existing programming options available on compatible lights, ensuring user-friendly operation. Durable Construction: Made from CNC machined 6061-T651 aluminum with a MIL-A-8625 Type III hard coat anodized finish for long-lasting durability. Manufactured in the USA.