The SureFire X400UH was specifically designed to be used with the MasterFire Rapid Deploy Holster. This weaponlight is compatible with nearly any type of handgun with an accessory rail and can interface with SureFire's MasterFire holster. When your handgun is equipped with the X400UH, it locks into the MasterFire holster at just the right angle for fast deployment and can be adjusted to automatically activate both light and laser when drawn. The light itself utilizes SureFire's own TIR lens to produce a powerful beam of 1000 lumens. This beam is so intense it can temporarily impair your target's vision. The laser is available in either a standard red 635 nanometer beam or a high-visibility green 515 nanometer beam, both of which are highly visible to the naked eye. Features of the SureFire X400UH Weaponlight Designed for use with MasterFire Rapid Deploy Holster 1000 lumen beam 213 illumination distance Available with red or green lasers IPX4 waterproofing SureFire X400UH-A Ultra 1000 LU Handgun Holster WeaponLight & Red Laser for MasterFire RDH X400UH-A-RD