Update firmware of compatible CANON lensesUpdate firmware of the TAP-in Console™ itselfAllows lens focus adjustments to be madeFocus distance limiter customization (for lenses with Focus Limiter feature)Full-time Manual Focus override customization (for lenses with Full-time Manual Focus feature)Allows VC adjustment (for lenses which have VC)Save customized data filesFree Tamron TAP-in Utility, available for Mac and Windows OSPower source: USB bus powered (via supplied USB cable)Dimensions: 72 x 26mm