This is a universal patient response button, also called "the clicker", which can be used for visual field units. Please check the plug in the photo compared to your unit. This is NOT compatible with the FDT and Matrix units. Please see our other listing for the correct plug.
Compatible with Zeiss / Humphrey 720, 720i, 730, 735, 740, 740i, 750, 750i
Items are sold as-is with no returns or refunds available unless explicitly stated.