You are bidding on an open box but newHP PROCURVE J8712A#ABA power supply. This unit was opened, used once for testing and left on a shelf for a year. It was never put into production. It was moved around from storage location to another so there are very minor scratches but it's practicaly brand new. Below are more tech details form HP's website:

ProCurve Switch zl 875W Power Supply (J8712A)
Standard 875 W power supply for 5400 series switches. Supplies 273 W for PoE power plus 600 W for switch power.

Physical characteristics
Dimensions: 6.05 x 7.45 x 5.1 in. (15.37 x 18.92 x 12.95 cm)
Weight: 7.05 lb. (3.2 kg )

Electrical characteristics

• Voltage: 100:127 VAC/200:240 VAC
• Maximum Current: 12A/5.7A
• Frequency range: 50/60 Hz
• Power: 875 W

Notes
J8712A supplies 600 W chassis power and 273 W PoE power.One J8712A can power the J8697A chassis. Two J8712A supplies are required to power the J8698A chassis.See the ordering guide for more details on power supply selection for PoE power.