One Hundred Concepts ButtonBlocker 4T Pro Black. However we noticed one design issue that stood out during real-world use. The night vision button is significantly larger than the brightness buttons making it easy to accidentally engage NV mode. Even worse when exiting NV mode the optic defaults to its highest brightness setting. In critical moments thats far from ideal. So we set out to fix it.The result is the ButtonBlocker. This simple snap-fit shield shrouds the button assembly making it much harder to unintentionally activate the brightness controlsor the oversized NV buttonwhile still maintaining full functionality when you actually need it. A small solution to a frustrating problem designed the way it should have been from the start. Specifications for One Hundred Concepts ButtonBlocker 4XT Pro: Manufacturer: One Hundred Concepts Color: Black Features of One Hundred Concepts ButtonBlocker 4XT Pro SnapFit Installation Package Contents: One Hundred Concepts ButtonBlocker 4XT Pro One Hundred Concepts OHC-BB-4TPRO: ButtonBlocker 4T Pro Black