Capacities 8GB† , High-Speed Class Rating2 Class 4: 4MB/s minimum data transfer rate > microSD Card Dimensions 0.43" x 0.59" x 0.039" (11mm x 15mm x 1mm) > SD Adapter Dimensions 0.94" x 1.26" x 0.08" (24mm x 32mm x 2.1mm) > USB Reader Dimensions 0.984" x 0.478" x 0.104" (24.99mm x 12.14mm x 2.64mm) > Card Operating Temperature -13°F to 185°F (-25°C to 85°C) > Card Storage Temperature -40ºF to 185ºF (-40ºC to 85ºC) > USB Reader Operating Temperature 32°F to 140°F (0°C to 60°C) > USB Reader Storage Temperature -40°F to 185°F (-40°C to 85°C) > USB Reader System Requirements - System with USB support - Windows® 8.1 - Windows 8 - Windows 7 (SP1) (ReadyBoost™ not supported) - Windows Vista (ReadyBoost not supported) - Mac OS X v. 10.6.x+ - Linux v. 2.6.x+