WD Elements 4TB USB 3.0 Portable External Hard Drive - Capacity: 4TB - Interface: USB 3.0 Type-A - System Compatibility: Formatted NTFS for Windows® 10, Windows 8.1, Windows 7, Reformatting required for other operating systems - Contents: Portable hard drive, USB cable, Quick install guide - Operating temperature: 5°C to 35°C - Non-op. temperature: –20°C to 65°C - WDBU6Y0040BBK-WESN - 3 Years Limited Warranty