The Streamlight MACROSTREAM TAILCAP model 666013 upgrades your everyday carry with a convenient tail switch for easy, one-handed operation. This accessory replaces your existing MacroStream USB tailcap, providing momentary or constant-on activation with a simple press. Constructed from durable materials, the TAILCAP enhances the functionality and usability of your Streamlight flashlight, offering greater control and responsiveness in any situation. Improve your illumination tool and enjoy more intuitive operation.