Surface Pro 4
Microsoft Surface Pro 4 (Certified Refurbished) is currently not available.
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Overview Tech specs Reviews

[1] Up to 9 hours of video playback. Testing conducted by Microsoft in September 2015 using preproduction Intel Core i5, 256GB, 8GB RAM device. Testing consisted of full battery discharge during video playback. All settings were default except: Wi-Fi was associated with a network. Battery life varies significantly with settings, usage, and other factors.

[2] System software uses significant storage space. Available storage is subject to change based on system software updates and apps usage. 1GB = 1 billion bytes. For more information, see surface.com/storage.