Item description: Modle : Extreme PRO Digital Storage Capacity ：250 GB / 500 GB / 1TB / 2TB Compatible Devices ：Compatible with Desktops & Laptops Hard Disk Interface ：NVMe Brand ：Sandisk Interface Type：M.2 2280 Max Sequential Read ：3400 Max Sequential Write ：2500 Color ：Black Dimension (WxHxD): 3.17" x 0.86" x 0.08" Item Weight ：0.01 Pounds Buyer Note : About capacity: 250GB=approximately 200GB-240GB 500GB=approximately 440GB-490GB 1TB=approximately 880GB-980GB 1MB=1000KB.It is calculation difference between manufacturer and your PC. Your PC says 1GB = 1.073741824 Billion bytes where Market Defines 1 GB = 1.00 Billion bytes. Please Google “ssd real capacity” to get more information.The person pursuit of perfect is not recommended to buy. Warm Tips: About Speed: different test softwares will get different speed , speed will be affected by many different factors , our datas only as reference Package List: (Send by your choose) Sandisk Extreme PRO SSD x 1SanDisk Extreme PRO M.2 NVMe 3D SSD 250GB 500GB 1T 2TB Internal Solid State Drive PCIe