JetDrive™ 855 TS240GJDM855 Transcend's JetDrive 855 Thunderbolt™ PCIe portable SSD combines a JetDrive 850 PCIe SSD with a sleek aluminum Thunderbolt enclosure to instantly revitalize your Thunderbolt-equipped MacBook Pro, MacBook Air, Mac mini, or Mac Pro! Specifications: Appearance Dimensions (Max.)120 mm x 31.5 mm x 18.2 mm (4.72" x 1.24" x 0.72") Weight (Max.)88 g (3.10 oz) Interface Connection InterfaceThunderbolt 10 Gb/s/ Bus InterfaceNVMe PCIe Gen3 x4 Storage Flash Type3D NAND flash Capacity240 GB Operating Environment Operating Temperature0°C (32°F) ~ 60°C (140°F) Storage Temperature-40°C (-40°F) ~ 85°C (185°F) Operating Voltage15V