1:4 DVI DL splitters. One DVI input, 4 DVI outputs. With external power supply. Condition as good as new from 1st hand with original instruction manual.
PAssive DI Box. Galvanic isolation between inputs and outputs. To avoid ground loops and other disturbances in signal transmission. Usually used between instruments and mixer or amplifier. Inputs and outputs in 6.35 mm jack, output XLR. With ground lift switch.