The kit adapts the impedance of the coaxial cable 75 Ohm to the impedance of the symmetrical cable (twisted pair), ensures correct signal transmission over a distance:
450m in HDCVI technology at 720P resolution
250m in HDCVI technology at 1080P resolution
250m in HD-TVI technology at 720 / 1080P resolution
320m in AHD technology with 720P resolution
Mounting the "twisted pair" directly to transformers with one pair of wires, the others can be used to connect further transformers.
The price is for one piece (not a pair).