The NSP-2 is a generation 0 active infra red night vision sight. It is quite heavy and bulky, but when you think back to the 1960s this device was very advanced for its time. This one was build in Czechoslovakia, but it was developed by the Novosibirsk instrument-making plant (Новосибирского приборостроительного завода).
It uses a high powered infra red light to illuminate the area, like all active infra red night visions. The single stage image intensifier (or converter) tube provides a pretty clear and sharp image for a gen0+ tube.