J9739A: Aruba X331 165W 100-240VAC/12VDC Modular Power Supply

It is a 165W modular power supply with 12VDC output for the HPE J9739A, listed as the Aruba X331 165W 100-240VAC/12VDC Modular Power Supply.

HPE lists it as an option in the QuickSpecs for the 2920 switch series, as the supply included with the non-PoE models J9726A and J9728A.

J9739A specifications: Type Power supply; model X331; output 12VDC 165W; input 100-240VAC; listed for Aruba 2920; part of the HPE Aruba / ProCurve switches product line.