Focusmate Driver, designed for scopes with black pinion bodies. It is Works on the following scopes: larger scopes with the following serial #s and higher: TVNP-127is (#1175), TVNP-101is (#1227), & TVNP101 (#1982) ; TV-76 and TV-85 that came with Focusmate 10:1 standard. Permits vibration-free, variable-speed, electronic motor control of the 10:1 Focusmate Fine Focus Accessory through a hand controller or computer control. A tap on the button permits vibration-free focusing in steps as small as approximately 0.0005" or download TVFocusPlus. Switching between manual and motor focus is easily done with a unique quick disconnect that doesn't require tools.