Two Mellanox IS5022 InfiniScale IV QDR InfiniBand switches sold together as a job lot. 
Specifications:
Mellanox P/N: 851-0167-01 Rev A1
Mellanox MPN: MIS5022Q-1BFR family
Family: InfiniScale IV / IS5022
8 x QSFP ports, 40Gb/s QDR per port
640Gb/s aggregate, non-blocking switching
100ns port-to-port latency
1U half-width rack form factor
Externally managed - needs OpenSM running on a connected host, or Mellanox UFM / FabricIT EFM
I2C RJ-45 management port for firmware/debug
AC input 100-240V 50/60Hz, internal PSU, integrated power switch

Both units power up. Status LED and Fan LED green on power-on with no fault indicators Pulled from a working environment, light cosmetic marks consistent with age and rack use. See photos for the actual units being supplied.