This product is either discontinued or we cannot get that from suppliers.
Qnap SP-5BAY-PSU Power Supply Unit, For Selected 5 Bay, Nas 250w Power Supply Unit For 5 Bay Ts-509 Pro, Ts-409u, Vs-5012/5008 Nas Units.
QNAP Power Supply Unit For Selected 5 Bay Nas SP-5BAY-PSU.