250W Redundant Power Supply Unit DPS-250AB-81A, Set of 2 These were removed from a QNAP TS-453U-RP. Operation has been confirmed. Compatible with redundant power supply models. 【Manufacturer】DELTA 【Model Number】DPS-250AB-81A 【Input】110-240 V～/5A-2.5A, 50-60Hz 【Output】Maximum output 250W 【Applicable Models】 QNAP NAS TS-453U-RP TS-853U-RP TS-1253U-RP TS-453BU-RP TS-453DU-RP TS-873U-RP TS-463XU-RP TS-464U-RP and others Although the operation of this product has been confirmed, it is a used item, so please consider this before purchasing. While there is a possibility of a price reduction at my discretion, I generally do not accept price negotiations.