This is the Macab Balun TVB-01 RJ45-male-IEC-male 2m [F3800001] TVB-01 is a balun working together with the amplifier TVB-02. That gives you the possibility to distribute standard TV, analoque or digital in any cat/cable. You need 4 TVB-01 to one TVB-02 ...Contact us if you need more help.