RS-144 switch panel designed for use with N-8000RS/N-8010RS 2-core shielded substation interface unit. It is equipped with emergency switch and normal switch, and can be installed in 1-gang electrical box. By connecting high impedance speaker to it, hands-free conversation with the master station can be made through its speaker. Also, it can be used in connection with the RS-141 IP intercom option handset.