Viridian Universal Mount Tactical Light w/ Strobe (338/418 Lumens) featuring ECR Battery Life - 60 min constant, 90 minutes strobe Construction - High strength Zytel polymer Light Output - 338 lumens Constant, 418 on strobe Activation - Automatic activation w/ ECR and User-defined operating modes Compatible with all Viridian TacLoc holsters for X Series