The SEM123N from Narda-MITEQ is a RF Switch with Frequency DC to 12.4 GHz, Insertion Loss 0.2 to 0.5 dB, Isolation 60 to 70 dB, Supply Voltage 28 V, Actuator Voltage 28 V. Tags: Module with Connectors, Electro-Mechanical. More details for SEM123N can be seen below.