This is not a physical product but a Lenovo post-warranty support service — "Post Warranty Service Foundation" — providing 9x5 Next Business Day (NBD) response coverage for a Lenovo server or system once its original manufacturer warranty has expired. Buying this extends hardware support (typically parts and technician dispatch) on a business-hours, next-business-day basis, letting an organisation keep a server covered without needing to replace still-functional hardware purely because its original warranty lapsed. This kind of SKU is bought alongside or after the fact for a specific already-owned Lenovo system, and the listing itself doesn't specify which hardware model or coverage duration it applies to.