Feel free to message. This is a 4GB Samsung DDR3L (PC3L) desktop RAM module operating at 1600MHz (PC3-12800). It features a low voltage design (1.35V) for energy efficiency. The module is manufactured in the Philippines and is a 240-pin DIMM form factor. It is tested. If there is any issue, you can return it within 3 days with proper proof. Otherwise, if you want to return it, you will get 80% cashback.