helmet, use two screws, guide rail need not tear open outfit, nut is placed within the guide rail, bad can freely adjust the suitable position, very simple operation, respectively, two series of headphones, GEN1 suitable for use in Comtac I/II headphones; GEN2 suitable for MSA headphones._x000D_ Two series of color:_x000D_ PT headset and helmet rail adapter_x000D_ - 3 colors in stock: DE/FG/Black