Lenovo ThinkCenter Business Desktop I5-6400|4GB DDR4Ram|500GB HDD|Win 10 Pro| 3yr. onsite Warranty| 10GT003EUS 1 x Intel Core i5 (6th Gen) 6400 / 2.7 GHz (3.3 GHz) (Quad-Core) Multiple monitor display Mouse is not included 3yr. Onsite Warranty Windows 10 Pro 64-bit Edition. Maximum expandable Ram memory: 32 GB