New in box.  Only opened for these photographs.

Dell 16 port Gigabit Ethernet switch.

Full Manual can be found here;
https://dl.dell.com/manuals/all-products/esuprt_ser_stor_net/esuprt_networking/esuprt_net_fxd_prt_swtchs/powerconnect-2816_user's%20guide_en-us.pdf