Wd elements desktop storage with usb 3.0 offers reliable, high capacity, add on storage, ultra fast data transfer rates and universal connectivity with usb 3.0 and usb 2.0 devices'. '.strtoupper('t')he sleek design features up to 3tb capacity plus wd quality and reliability'. '.strtoupper('i')t includes a free trial of wd smartware pro back up software for local and cloud back up'. '.strtoupper('g')eneral device type hard drive external desktop capacity 4tb interface usb 3.0 features ntfs formatted width 48 mm depth 135 mm height 165.8 mm weight 950 g power power source included ac adapter power device power adapter voltage required ac 120 230 v 50 60 hz software and system requirements software included wd smartware pro 30 days trial os required apple macos x, microsoft windows vista xp 7 8 miscellaneous cables included 1 x usb cable external compatible with windows 7 compatible with windows 7 software and devices carry microsofts assurance that these products have passed tests for compatibility and reliability with 32 bit and 64 bit windows 7'. '.strtoupper('c')ompliant standardsplug and play, rohs localisation emea